Secular Science Homeschool Curriculum: The Best Options by Grade Level

If you're a secular homeschooler, science is where the curriculum market creates the most friction. The most prominent, well-reviewed, widely available science programs — Apologia, Master Books, Noeo — are built on a Young Earth Creationist foundation. A secular family can't use them without constant filtering, and even then the worldview is structural, not cosmetic.

The good news: secular science curriculum has improved dramatically in the last decade. You have real choices now, with programs that teach evolution, an old-earth cosmology, the scientific method, and NGSS-aligned content without any religious framing. Here's what's actually worth your time.

The Secular Science Landscape

The science curriculum divide is the starkest in all of homeschooling. Unlike math, where "secular" and "religious" programs mostly teach the same algorithms, science is ideologically divided in ways that affect content, not just tone.

Explicitly secular programs teach evolution, billions-of-years cosmology, and standard scientific consensus on climate, genetics, and age of the earth. These include Real Science Odyssey, BFSU (Building Foundations of Scientific Understanding), Mystery Science, and Generation Genius.

"Neutral" programs typically avoid both evolution and creationism — they skip the controversy by focusing on topics where it doesn't arise (chemistry, physics, anatomy, ecology). These include many co-op-designed courses and some older publisher programs. They're usable for secular families but leave the origin topics entirely unaddressed.

Explicitly religious programs integrate creationism and biblical narrative throughout. They're not filterable for secular use.

If you want your child to understand the actual science on origins, evolution, and cosmology — the scientific consensus — you need a program from the first category.

National Science Standards and Homeschooling

The Next Generation Science Standards (NGSS) are the national framework most public schools use, developed by the National Research Council. They cover disciplinary core ideas, crosscutting concepts, and science and engineering practices across all grade levels.

Homeschoolers don't have to follow NGSS — one of the freedoms of homeschooling is standards flexibility. But NGSS alignment matters for two reasons:

1. College prep. If your student plans to take SAT Subject Tests, AP Biology, or any science-heavy college coursework, familiarity with standard scientific frameworks is valuable.

2. Avoiding gaps. NGSS-aligned programs have thought carefully about scope and sequence, ensuring key concepts are introduced at developmentally appropriate points.

Several secular homeschool programs explicitly align to NGSS: Generation Genius, Mystery Science, and Real Science Odyssey are the most prominent. This alignment doesn't mean they're identical to public school — it means the content coverage is comparable.

Best Secular Science Programs by Grade Level

K–5: Elementary Science

Mystery Science is the strongest elementary option for most secular homeschoolers. It uses video-based "mysteries" (compelling questions like "Why do cats always land on their feet?") to drive inquiry, followed by hands-on activities that require minimal prep. Lessons run 30–45 minutes, materials are household items, and the content is genuinely engaging. Secular, NGSS-aligned, and rated highly by parents with attention-challenged kids. Around $99/year for a family subscription.

Generation Genius is a video-first program styled after Bill Nye — high-energy, scientifically accurate, kid-friendly. It aligns to NGSS and works well as a supplement or core curriculum for K–8. Reading passages and quizzes accompany each video. Around $175/year.

Blossom and Root is a secular, Charlotte Mason-influenced curriculum for K–5. Science is woven through nature study, picture books, and hands-on projects rather than textbooks. Lighter on content density than Mystery Science but excellent for families who want a gentle, literature-based approach.

For nature study specifically, nature journaling combined with Charlotte Mason-style observation books (Handbook of Nature Study by Anna Botsford Comstock) is free, rigorous, and extremely effective at building scientific observation skills.

6–8: Middle School Science

Real Science Odyssey (RSO) is the most comprehensive secular option for middle school. It covers one major topic per year (Biology, Earth and Space Science, Chemistry, Physics) with detailed teacher guides, student pages, and lab experiments using inexpensive materials. Explicitly secular, evolution-teaching, and written by working scientists. Each level runs around $90–$100.

BFSU (Building Foundations of Scientific Understanding) by Bernard Nebel is a teacher-intensive guide for K–8 that builds interconnected scientific concepts rather than isolated facts. Secular, rigorous, and inexpensive (around $30 per volume), but it requires significant parental preparation and is not "open-and-go." Best suited for scientifically confident parents.

Nancy Larson Science covers grades K–6 with a scripted, secular program. Lower-prep than BFSU, more structured than CM approaches.

9–12: High School Science

High school science is where secular homeschoolers have the most options and the highest stakes (transcript-building, college prep).

Real Science Odyssey Level 2 (Biology, Chemistry) continues the RSO sequence into high school.

Spectrum Science and CK-12 (free, online) provide secular textbooks for high school physics, chemistry, and biology. CK-12 is particularly useful for budget-conscious families — it's entirely free and covers high school content with digital textbooks, practice problems, and adaptive quizzes.

Thinkwell and Coursera offer video-based secular high school and college-level science courses. Thinkwell's biology and chemistry courses are particularly well-regarded.

Dual Enrollment: The single best high school science option for many secular homeschoolers is dual enrollment at a community college. A semester of college biology covers more rigorous content than most high school programs, generates a college transcript, and is often free or reduced-cost. Most community colleges welcome homeschooled students.

Khan Academy is an indispensable free supplement at every level. Its science content (particularly Biology, Chemistry, Physics) is NGSS-aligned, secular, and well-sequenced. Use it alongside any of the above programs for additional explanation and practice problems.

The Lab Question

The biggest logistical challenge in secular science curriculum — especially at the high school level — is lab work. College-prep science programs increasingly want documented lab experience, and most home lab kits are either inadequate or expensive.

Solutions: - Co-op labs: Many secular co-ops run shared science labs with proper equipment - Online virtual labs: Labster and PhET (free, University of Colorado) offer virtual lab simulations for physics and chemistry - Community college labs: Dual enrollment typically includes actual lab time with real equipment - Home lab kits: Real Science Odyssey and some other programs sell their own kits with supplies calibrated to the experiments they specify

Documenting labs matters for the transcript. Keep a lab notebook with procedures, observations, and conclusions — this can be submitted as evidence of lab work for competitive college applications.

Choosing Between Programs

The most important variables:

Parent prep time. Mystery Science requires almost none; BFSU requires significant reading and preparation. Be honest about what you'll actually sustain across a school year.

Child's learning style. Video-based programs (Mystery Science, Generation Genius) work well for visual and auditory learners. Hands-on lab-centric programs (RSO) work better for kinesthetic learners. Nature-study approaches (Blossom and Root) work best for kids who do their best learning outdoors.

Budget. CK-12 (free) + Khan Academy (free) + library books is a legitimate high school science program. Mystery Science ($99/year) is the most affordable complete elementary option.

The United States Curriculum Matching Matrix includes a detailed science section with worldview ratings, prep-time scores, true cost breakdowns (including lab kits and consumables), and grade-level comparisons — all in one view, so you can find the secular program that fits your child's learning style without opening 20 browser tabs.