The Best 3rd Grade Science Curriculum

In 2019, only 36% of U.S. fourth graders performed at or above “Proficient” in science on the National Assessment of Educational Progress (NAEP), which is a warning sign that many children are not building solid science understanding by the end of elementary school. Third grade is often when families feel the pressure of that gap starting to form, because curiosity is still high, but science can easily drift into scattered crafts, random facts, or weeks that quietly disappear when life gets busy. To find the best third grade science programs, we reviewed widely used homeschool curricula, kits, and free supplements and prioritized options that are secular, scientifically accurate, engaging, and designed to build mastery over time.

For most third graders, Blossom and Root Third Grade (Science and Nature Study) is our top pick because it makes science feel alive through nature study, rich books, and gentle projects that preserve wonder while still building real knowledge. It is an ideal fit for families who want science to happen outdoors and at the library as much as at the table. The main drawback is that it requires parents to source books and materials and it can feel slower paced than a traditional textbook, which is why we also recommend strong alternatives for families who want a more structured, experiment heavy approach.

How we vetted

Third grade science should do more than sprinkle in fun activities. A strong program should help children build scientific habits: observing carefully, asking good questions, recording what they notice, and explaining what happened using evidence. We also look closely at scientific integrity, because elementary science misconceptions can be difficult to unlearn later. In practice, we review scope and sequence, sample lessons, and the “work” students are asked to do, because a program that looks charming can still be thin on understanding. Finally, we consider practicality for real homes. A program can be academically strong and still fail if it demands unrealistic preparation, confusing materials lists, or a pacing plan that collapses under everyday life.

• Secular. We prioritize non-religious programs that include evolution and climate change where relevant and do not offer a religious perspective as an “alternative” explanation.
• Scientifically accurate. We look for content that is accurate according to modern science, uses correct terminology, and avoids errors and misinformation.
• Engaging. We favor resources children genuinely enjoy and stay engaged with, whether the teaching is delivered through books, videos, discussion, or projects.
• Mastery based. We choose programs that build concepts in a logical sequence, check for real understanding, and require application before moving forward.
• Aligned with NGSS. We prioritize resources that reflect NGSS expectations, including scientific practices, crosscutting concepts, and coherent grade-band content.

Our top choice overall: Blossom and Root Third Grade (Science and Nature Study)

Blossom and Root Third Grade (Science and Nature Study) is a nature based science program designed to keep scientific curiosity intact while steadily building knowledge through observation, literature, and gentle projects. It works especially well in third grade because children are old enough to record observations, compare patterns, and discuss “why” questions, but still young enough to learn best when science feels lived and connected to the outdoors. The program guides families through topics using curated books, nature study routines, hands on activities, and art or notebook work that helps children process what they learn.

What sets Blossom and Root apart is its ability to make science feel joyful without turning it into fluff. Families who want science to feel calmer and more meaningful often find it easier to stay consistent with this approach across a full year. The tradeoff is logistics. Parents need to source books and supplies, and the pace can feel relaxed for children who crave a more systematic, lab forward program. For most families, it is still an excellent value because the experience is rich, memorable, and genuinely sustainable.

What parents like

Parents choose Blossom and Root because it makes science feel connected to real life, not like a school subject that has to be “sold” to a child. They also appreciate the flexibility, because families can move at a steady pace without pressure to rush.

• The program preserves wonder and curiosity while still providing a clear plan for the year.
• Nature study routines help children build observation skills and scientific habits through repeated practice.
• The book lists and read aloud approach can make science feel rich and memorable.
• The structure is flexible enough to adapt to seasons, field trips, and family scheduling needs.
• The activities feel meaningful rather than worksheet heavy, which helps many children stay engaged.

What parents think could be improved or find frustrating

The biggest frustrations are usually about preparation rather than the quality of the ideas. Some families also want a faster paced, more systematic science sequence than a nature based program typically provides.

• Parents often need to source books and materials, which can add planning time.
• The pace can feel slow for children who want a more intensive or concept dense approach.
• Families in harsh weather climates may need to adapt outdoor activities to keep science consistent year round.
• Some parents want more explicit assessments to document understanding and progress.
• Children who prefer frequent structured experiments may benefit from adding a lab focused supplement.

Alternatives to Blossom and Root for different learners

LearnLibre

LearnLibre is a Montessori inspired science resource that differentiates itself with succinct, visually rich lessons designed to be clear, calm, and easy to follow. Families often use it as a supplement or a light core when they want straightforward instruction without heavy preparation, and it can be especially helpful for students who benefit from concise explanations and beautiful imagery. It is an ideal fit for parents who want a simple weekly rhythm and a resource that supports independent work with light oversight, and it can also be a helpful second explanation when a concept does not click the first time. It is not a great fit as a stand alone program for families who want frequent hands on investigations, a fully mapped year plan, or robust assessment and lab documentation. Parents like the clarity, pacing, and design, but some wish it included more built in experiments and deeper extension work. Cost is typically a low monthly subscription, around $14 per month or about $168 per year, which is strong value for families who want a reliable, high quality supplement that is easy to sustain.

What parents like

• The lessons are concise and visually clear, which helps many children stay focused.
• The resource can support independent work with light parent oversight.
• It is useful as a second explanation when a concept does not click the first time.
• The tone feels calm and approachable for children who become overwhelmed easily.

What parents think could be improved

• Families often want more hands on investigations to accompany the lessons.
• Some parents prefer a more explicit year plan that maps lessons into a complete sequence.
• Advanced students may need deeper extension work to feel challenged.
• Children who dislike video based instruction may prefer a print centered option.

Evan Moor Science Homeschool Bundle Grade 3

Evan Moor Science Homeschool Bundle Grade 3 is a workbook based science option designed to make daily science simple, predictable, and easy to implement. What differentiates it is the clear, structured format that supports consistent practice and accountability, which many families appreciate when science tends to get pushed aside. It is an ideal fit for busy parents who want low prep work, for students who do well with short written assignments, and for families supplementing school with a steady routine. It is not a great fit if your goal is investigation driven science with frequent experiments, or for children who disengage when science becomes mostly reading and writing. Parents like that it is straightforward and easy to track, but many feel it needs more hands on learning to deepen understanding. Pricing varies, but it is generally priced like a typical workbook bundle and is often one of the more budget friendly ways to keep science consistent, especially when paired with a weekly experiment or nature observation day to improve value.

What parents like

• The daily structure is straightforward, which supports consistency across the year.
• The program requires minimal preparation, which is helpful for busy parents.
• The lessons reinforce vocabulary and science reading comprehension.
• Assignments are clearly defined, which makes accountability easier.

What parents think could be improved

• The approach can feel worksheet heavy for children who need investigation to stay engaged.
• Families often need to add experiments to build stronger scientific reasoning.
• Some students find workbook science less motivating than project based programs.
• Advanced learners may want richer explanations and more challenging application.

Khan Academy Science

Khan Academy Science is the strongest free science option for third grade support, and it differentiates itself with short, clear lessons paired with immediate practice that helps families see what a child understands. It is an ideal fit for review, reteaching, targeted practice, and confidence building, especially when a child needs a second explanation or when parents want a low effort way to keep science skills moving forward. It is not a great fit as a complete third grade science plan for most homeschoolers, because it does not provide a coherent hands on lab sequence, extended investigation, or the kind of documentation families often want. Parents like that it is free and easy to use, but some find the experience can become passive unless adults require notes, discussion, or follow up work. Cost is free, which makes the value exceptionally high when used as a supplement alongside a richer program that provides experiments, projects, and discussion.

What parents like

• The resource is free, which makes it easy to add without increasing your budget.
• Short lessons make it easier to target specific concepts that are not sticking.
• The self paced structure supports review and remediation without pressure.
• Practice can help parents see gaps clearly and respond with targeted support.

What parents think could be improved

• It does not provide a full hands on science routine without additional resources.
• Some children treat it as entertainment unless parents require active response.
• The learning can feel fragmented if families do not choose a coherent sequence.
• Children who need tactile learning may not retain concepts without experiments.

KiwiCo

KiwiCo is a hands on STEM subscription that differentiates itself through high interest building projects that encourage children to design, test, and improve what they make. Families often use it to keep science active and motivating, especially for students who learn best when they can build and troubleshoot. It is an ideal fit as a supplement to a core science program or as a weekly project routine that keeps curiosity high, and many parents appreciate that materials arrive ready to use. It is not a great fit if you need a coherent third grade science scope and sequence across life, Earth, and physical science, or if your household is sensitive to clutter and ongoing subscription costs. Parents like that projects feel purposeful and satisfying, but some wish the kits included deeper scientific explanation and stronger connections across topics. Pricing typically starts around $24.95 per month depending on plan and crate level, which can be good value for families who consistently use the projects and add reflection questions, but less cost effective if you are also purchasing a full curriculum and the kits pile up unused.

What parents like

• The projects are engaging and hands on, which supports motivation for many children.
• Materials arrive ready to use, which reduces parent planning and supply shopping.
• Builds naturally support problem solving and persistence through trial and error.
• It pairs well with a book based curriculum or nature study for broader coverage.

What parents think could be improved

• It does not replace a coherent year long science curriculum with full coverage and assessment.
• Subscription costs can become significant across many months.
• Some children want deeper explanation than a kit format naturally provides.
• Families may need to add reflection questions to connect projects to underlying concepts.

Mel Science STEM experiments for kids

Mel Science STEM experiments for kids is a subscription kit that differentiates itself with high quality materials and a strong digital companion experience, including clear video guidance and an app that helps children understand what they are doing. Families often choose it when they want hands on experiments without spending hours sourcing supplies, and it can be an ideal fit as a consistent lab day supplement alongside a core science spine. It is not a great fit as a complete third grade curriculum for most families because it is not designed as a fully coherent year long sequence with systematic coverage, writing expectations, and assessment. Parents like the app experience and the reliability of the experiments, but some wish the boxes were more intentionally sequenced and more concept rich, and some find the subscription can feel repetitive over time. Cost typically starts around $29.90 per month, which can be strong value when families consistently use the app and require a short written or spoken conclusion after each experiment, but less cost effective if it replaces concept teaching rather than reinforcing it.

What parents like

• The kits reduce preparation time because materials and instructions are organized for you.
• Hands on experiments can re engage children who feel bored by worksheets.
• The routine supports consistency because science shows up regularly without heavy planning.
• Many children remember concepts better after they have observed results directly.

What parents think could be improved

• It is a supplement rather than a complete third grade curriculum for most families.
• Subscription costs can be a barrier when families are already funding core curriculum.
• Some experiments are messy and require a protected workspace and cleanup time.
• Projects can feel disconnected unless parents link them to broader concepts being studied.

Green Kid Crafts

Green Kid Crafts is a nature friendly STEM kit subscription that differentiates itself with eco conscious materials and themes that connect naturally to the environment. Families often choose it for younger elementary because projects are approachable, hands on, and easy to implement, and it can be an ideal fit for households with younger siblings where one kit can serve multiple children. It is not a great fit as a complete third grade science curriculum if you need systematic coverage and coherent sequencing across the year, and some older third graders may want deeper explanation than a kit format provides. Parents like that the activities feel fun and positive and that the environmental emphasis supports meaningful conversation, but some find they need to add more explicit science concept teaching and more writing or reflection. Pricing is typically around $33.95 per box or about $347.40 for a full year subscription, which can be good value for families who want eco oriented hands on projects delivered to the door, but it works best when paired with a science spine to ensure depth and continuity.

What parents like

• The projects encourage hands on exploration and can make science feel fun and approachable.
• The eco conscious emphasis supports conversations about nature and stewardship.
• Kits can be used with multiple children, which can increase value for larger families.
• The activities can support a consistent science routine without heavy planning.

What parents think could be improved

• It is not a complete curriculum and usually needs a concept teaching spine.
• Some children outgrow certain projects without added challenge and deeper explanation.
• Cleanup and storage can still be frustrating for families with limited space.
• Parents may want more explicit science instruction connected to each activity.

For earth and environment

Real Science Odyssey Earth Environment 1

Real Science Odyssey Earth Environment 1 is an inquiry oriented earth and environmental science course that differentiates itself with project based lessons that push students to model systems, notice patterns, and explain phenomena using evidence. Families often choose it when a child is drawn to weather, rocks, landforms, and nature observation and they want a structured plan that is still hands on and screen light. It is an ideal fit for homes willing to facilitate investigations and discussion, especially if you want science skills like recording data and drawing conclusions to become routine. It is not a great fit for families seeking minimal prep, or for students who strongly prefer a teacher on video to carry instruction. Parents like the meaningful projects and the coherence of the sequence, but some find the logistics demanding and need to scaffold writing and lab notes. Pricing depends on format, but it is typically similar to other Real Science Odyssey texts, often in the mid $40s to low $50s for digital and the $70s to $80s for print, which is strong value if you want an earth science spine with real investigations rather than a collection of activities.

What parents like

• The projects make Earth science concepts concrete through investigation and modeling.
• The course encourages evidence based explanation instead of memorizing vocabulary.
• The structure supports consistent progress through a coherent sequence.
• It pairs naturally with field trips and outdoor observation.

What parents think could be improved

• Hands on lessons require preparation and materials gathering, which adds parent workload.
• Some children need support writing down observations and conclusions consistently.
• Families seeking an open and go routine may find the logistics challenging.
• Children who prefer direct video teaching may want supplemental explanations.

For biology

Real Science Odyssey Biology 1

Real Science Odyssey Biology 1 is a project based life science course that differentiates itself by treating biology as something students investigate, not just something they read about. Families often choose it when a child loves animals and ecosystems and they want a science plan with hands on observation, experiments, and structured activities that build real understanding. It is an ideal fit for homes that want a secular biology spine with meaningful investigation and are willing to facilitate labs and discussion, and it can pair naturally with nature study and field trips. It is not a great fit for families who need fully independent lessons with little parent involvement, or for students who rely on frequent video instruction to stay engaged. Parents like that the sequence feels purposeful and that activities encourage careful observation and explanation, but some find supply gathering and writing expectations challenging without scaffolding. Pricing varies by format, but it is typically in the same range as other Real Science Odyssey texts, often around the mid $40s to low $50s for digital and the $70s to $80s for print, which is strong value for a coherent biology course with real investigations.

What parents like

• The investigations help children build real science skills through observation and explanation.
• Hands on activities make life science concepts memorable and concrete.
• The sequence provides structure without relying on heavy screen time.
• The program supports meaningful discussion about the living world.

What parents think could be improved

• Preparation and supply gathering can take time, especially before lab days.
• Some children need help recording observations and drawing clear conclusions.
• Families seeking minimal prep may find the hands on workload challenging.
• Children who want a video teacher may benefit from supplemental multimedia.

For astronomy

Real Science Odyssey Astronomy 1

Real Science Odyssey Astronomy 1 is a structured astronomy course that differentiates itself through hands on models and investigations that help students understand big, abstract ideas about the sun, moon, planets, and the universe. Families often choose it when a child is captivated by space and they want that interest to become a coherent science study with real scientific thinking built in. It is an ideal fit for independent readers who enjoy building models and for families who want a screen light plan that still feels academically serious. It is not a great fit for homes that need minimal prep, because projects require materials, occasional outdoor observation, and adult support to connect activities to concepts. Parents like the motivation astronomy naturally brings and the way models make concepts understandable, but some find weather, location, and scheduling can complicate observation activities and some students need extra support with measurement and spatial reasoning. Pricing depends on format, but it is typically similar to other Real Science Odyssey texts, often in the mid $40s to low $50s for digital and the $70s to $80s for print, which is strong value if space science keeps your child consistently engaged.

What parents like

• The topic is inherently motivating and helps science feel exciting and meaningful.
• Hands on models make abstract space concepts easier to understand.
• The program supports real scientific thinking through investigation and explanation.
• It works well as a structured unit study or a complete astronomy year.

What parents think could be improved

• Families need to plan for supplies and projects, which adds preparation time.
• Weather and location can limit some observation activities without adaptation.
• Some children need extra support with spatial reasoning and measurement.
• Students who want video instruction may prefer added multimedia explanations.

For physics

Real Science Odyssey Physics Level One

Real Science Odyssey Physics Level One is a hands on physics course that differentiates itself by building intuition through experiments and models rather than relying on definitions alone. Families often choose it when a child loves building and testing and they want physics ideas like motion, forces, energy, and simple machines to become concrete through investigation. It is an ideal fit for homes willing to facilitate labs and discussion and for students who learn best when they can see cause and effect play out in front of them. It is not a great fit for families seeking a fully open and go plan or for students who need a video teacher to stay engaged, and some parents prefer to double check explanations because a few families report occasional inaccuracies in some physics materials. Parents like the active learning and the coherent sequencing, but they often note preparation, cleanup, and writing expectations as the main friction points. Pricing varies by format, but it is typically in the same range as other Real Science Odyssey texts, often around the mid $40s to low $50s for digital and the $70s to $80s for print, which is solid value if you want a true physics spine rather than one off experiments.

What parents like

• The experiments make physics concepts concrete and easier to understand.
• The course develops scientific reasoning through prediction, testing, and explanation.
• The structure provides a coherent sequence instead of random physics activities.
• It can be especially motivating for children who like building and tinkering.

What parents think could be improved

• Parents need to gather materials and facilitate experiments, which increases workload.
• Some families struggle to schedule consistent lab time, especially in busy seasons.
• Children who resist writing may need scaffolding for lab notes and conclusions.
• Students who prefer a teacher on video may want supplemental instruction.

Mel Science Physics Science Experiments Subscription

Mel Science Physics Science Experiments Subscription is a physics focused subscription kit that differentiates itself with high quality materials and structured experiments that make abstract physics ideas feel visible and real. Families often add it because physics can be intimidating, and a kit lowers the barrier to actually doing experiments by providing supplies and clear guidance. It is an ideal fit as enrichment or as a lab supplement alongside a physics spine, especially for students who understand best when they can build and test. It is not a great fit as a complete physics course because it does not provide a full year scope, systematic problem solving, or formal assessments, and it requires a safe workspace and time for cleanup. Parents like that experiments feel concrete and that materials are largely included, but some want stronger sequencing and more explicit concept instruction between boxes. Pricing typically starts around $30 per month depending on plan, which can be strong value if you consistently use it as your hands on lab layer, but it can add up quickly if you already have a full curriculum budget.

What parents like

• The kits make physics feel concrete, which can reduce intimidation for younger students.
• Supplies are largely included, which lowers the barrier to doing real experiments at home.
• Hands on work can improve retention because children see forces and motion in action.
• The subscription format makes it easier to keep physics consistent across the year.

What parents think could be improved

• It is a supplement, so families still need a core physics plan for coherent coverage.
• Subscription costs can add up across a full school year.
• Some experiments require setup and cleanup that can be challenging in small homes.
• Projects can feel disconnected unless parents connect them to broader concepts being studied.

For chemistry

Real Science Odyssey Chemistry Level One

Real Science Odyssey Chemistry Level One is a project based chemistry course that differentiates itself by treating experiments as evidence gathering, not just entertainment. Families often choose it when a child loves mixing, testing, and asking why reactions happen and they want chemistry taught through investigation with clear connections back to concepts. It is an ideal fit for homes that want a secular, scientifically grounded chemistry experience and are willing to supervise experiments and guide discussion, and it can build excellent science habits like careful observation and clear explanation. It is not a great fit for families seeking minimal prep or low mess learning, because chemistry experiments require planning, supervision, and cleanup. Parents like that the lessons feel like real science rather than random reactions, but some find sourcing materials time consuming and want more explicit support for writing and conclusions. Pricing depends on format, but it is typically similar to other Real Science Odyssey texts, often in the mid $40s to low $50s for digital and the $70s to $80s for print, which is strong value for a coherent chemistry spine with meaningful, concept linked experiments.

What parents like

• The investigations help children build real understanding through evidence and explanation.
• Hands on experiments make chemistry concepts memorable and concrete.
• The sequence provides structure while still feeling active and inquiry oriented.
• The program supports strong science habits such as careful observation and recording results.

What parents think could be improved

• Supply gathering and preparation can take time, especially early in a unit.
• Some experiments require careful supervision and a consistent workspace.
• Cleanup can be frustrating for families who prefer low mess learning.
• Children who prefer video teaching may want supplemental explanations.

NGSS science standards for 3rd grade

Third grade NGSS expectations emphasize using evidence, noticing patterns, and explaining how systems work, especially in ecosystems and weather. In practice, a strong third grade science year often includes goals such as:

• Exploring ecosystems and interdependence, including how organisms interact and how environments support life.
• Studying inheritance and variation of traits, including how traits are passed on and how variation affects survival.
• Representing and interpreting weather data, including using tables and graphs to describe seasonal patterns.
• Comparing climates in different regions and discussing how climate influences life and human activity.
• Designing and evaluating solutions that reduce the impact of weather related hazards.
• Practicing engineering design by defining a problem, proposing solutions, testing, and improving a design.

What's the point of science? How to convince your kid to learn science

Third graders are more motivated when science feels like a way to understand what they already notice, not a subject to “get through.” Science teaches children how to ask questions, test ideas, and change their mind when evidence demands it. That matters in daily life, from understanding weather and the natural world to evaluating claims they hear online. When children see science as a tool for making sense of real experiences, they are more willing to do the careful work that real understanding requires.

Motivation improves when you connect each unit to a practical “why.” Start with an everyday phenomenon, such as why puddles disappear, why some animals travel in groups, or why seasons change. Ask your child to predict what they think will happen before you explain it. After an experiment, ask for a short explanation in their own words supported by what they observed. End units with something concrete, such as a labeled drawing, a simple data chart, a model, or a short nature journal entry. When science feels like curiosity plus competence, children usually persist.

Further reading

If you want a bigger picture view of strong secular options across grade levels, start with The Best Secular Science Programs for Homeschoolers, which explains what to look for in scientifically accurate programs and how to avoid common red flags. If you are deciding whether to slow down for true understanding or move faster for broader coverage, So what’s the big deal about Mastery Learning? offers a clear framework for pacing science so it actually sticks. If your child loves science videos and you want a trustworthy list of educators to pair with hands on work, 200 Amazing Educational YouTube Channels includes many strong science teachers and demonstrations. If your family wants science to connect more directly to ecology and the natural world, Our six favorite environmental science programs for kids (and grownups) can help you choose an environmental focus that is still rigorous. And if you want curated recommendations matched to your child’s needs and your family’s schedule, Modulo’s Free Curriculum Planner can help you build a plan you will actually finish.

About your guide

This guide reflects the curriculum research approach led by Manisha Snoyer, founder of Modulo and the writer behind Teach Your Kids. Her work focuses on helping families choose secular, high quality learning resources that are both academically strong and realistic to implement at home. Science is one of the hardest subjects for parents to evaluate because program quality varies widely, hands on learning can be logistically challenging, and misleading “neutral science” framing can quietly undermine scientific accuracy. Manisha’s approach prioritizes scientific correctness, clarity, and student motivation, because a program only works if children actually understand and complete it.

For third grade science, her focus is on protecting curiosity while building foundations. Students should practice noticing patterns, recording observations, and explaining cause and effect in simple, evidence based language. A strong third grade year should also keep science active and connected to the real world, because confidence and curiosity now make later science far easier.

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