ACS Middle School Chemistry (6th to 8th)
This course is taught using a downloadable textbook.
CK-12 (K to 12th)
Flexbook textbooks are available for kindergarten through 5th grade science. Middle school and high school Flexbooks offered are Earth Science, Life Science, Physical Science, Biology, Chemistry, Physics, and Astronomy.
CPO Science (6th to 8th)
Focus on Earth Science and Focus on Life Science textbooks are available for download.
Easy Peasy All-in-One Homeschool (1st to 8th) C
Courses are taught using a variety of online sources. Courses offered are Zoology, Biology, Earth Science, and Chemistry/Physics. Each course is available at two different levels. Level L is for 1st through 4th grades, and Level M is for 5th through 8th grades.
Easy Peasy All-in-One High School (9th to 12th) C
Courses are taught using a variety of online sources. Courses offered are Oceanography, Biology, Earth Science, Chemistry, Physics, and Forensics.
edX (10th to 12th)
EdX, a nonprofit created by Harvard and MIT, offers a wide variety of science courses, including anatomy, chemistry, biology, medicine, earth science, and more. The length and format vary from course to course, and availability changes periodically. The courses are free to audit, or certificates of completion are also available for a fee.
FearOfPhysics.com (11th to 12th)
This online physics course is designed for college but may be used by advanced high school students. The material is taught with video lectures. Downloadable notes and practice problems are also included.
Forensics Illustrated (9th to 12th)
This forensic science course includes an online textbook, PowerPoint presentations, practice worksheets, projects, tests, labs, and answer keys.
Guest Hollow’s Biology (9th to 12th) C
Guest Hollow’s Biology includes a free textbook (which can be accessed online or downloaded), a workbook, answer key, Bible/creation study, labs, and links to videos among other resources.
Houghton Mifflin Science (K to 6th)
Science concepts are taught with online textbooks.
Khan Academy (9th to 12th)
Lessons are taught using videos. Some courses also include online practice questions and tests. Courses include Physics, Cosmology & Astronomy, Chemistry, Organic Chemistry, Biology, and Health & Medicine. Several AP courses are also available.
The MESS curriculum is made up of 10 month-long downloadable units. Each unit includes science experiences, suggestions for ways to integrate the topic across the curriculum, and a list of recommended books. If the suggested books aren’t available at your library, you may substitute other books on the topic.
McGraw-Hill Science (1st to 6th)
Each grade level of science is made up of three downloadable books: Interactive Textbook, Reading and Writing in Science, and Activity Lab Book. While these books were written for California public schools, they can be used by homeschoolers in any state.
MobyMax (K to 8th)
MobyMax teaches science through the use of interactive online lessons. While the free version includes the entire curriculum, there is also a paid version available that includes additional features.
Modern States (10th to 12th)
Modern States courses prepare students to take College Level Examination Program (CLEP) exams. Students can earn college credit through CLEP exams while still in high school, making college more accessible and affordable. Courses are available for natural science, biology, and chemistry.
Mr. Q’s Classic Science (1st to 6th)
Mr. Q’s Life Science student textbook and parent’s guide are both free to download. Other science courses are available for purchase.
MS Nucleus (K to 6th)
Online lesson plans, storybooks, slideshows, and activities are provided for each grade.
Mystery Science (K to 5th)
This website requires a paid membership, but they usually offer one year free for first-time users. Video lessons, handouts, lesson plans, and activity instructions are included for each topic.
Old Earth Ministries (6th to 12th) C
This organization offers the following courses from an Old Earth Creationism perspective: Geology, Earth History, and Dinosaurs. Each course is one semester in length and is high school level but may be used for advanced middle school students. The material is taught through the use of online text, research questions, quizzes, and tests.
OpenLearn (10th to 12th)
OpenLearn offers courses on numerous science topics. The length and formats of the classes may vary.
OpenStax (10th to 12th)
OpenStax offers downloadable student textbooks, instructor guides, and other instructor resources for Anatomy & Physiology, Astronomy, Biology, Concepts of Biology, Microbiology, Chemistry, College Physics, and University Physics Volumes 1 to 3. While these courses are intended for college students, motivated high school students may be able to complete some of them.
Parallel Alternative Strategies for Students (9th to 12th)
These downloadable science courses are designed to help students with special needs succeed. Each course includes a student workbook and teacher’s guide. Courses available are Biology, Physical Science, and Earth/Space Science.
Saylor Academy (10th to 12th)
Saylor Academy is a nonprofit initiative offering courses at the college and professional levels. However, high school students may also take their classes. Saylor currently offers chemistry and physics courses.
Science Matters (4th to 6th)
Science Matters provides downloadable inquiry-based science units. The units cover life science, physical science, and earth science.
Siyavula Science Textbooks (4th to 12th)
These downloadable textbooks follow the South African school syllabus, but can likely be used by residents of other countries as well. Textbooks are available for natural science, technology science, physical science, and life science. There is also a teachers guide for each course.
Teach Preschool Science (Pre-K to 1st)
This website provides lesson plans for 75 science-related learning experiences. Each discovery-based lesson also includes extensions to other curriculum areas.
Thunderbolt Kids (4th to 6th)
These online textbooks teach natural science and technology. The books were written for students in South Africa, but homeschoolers around the world may use them too.
Toward a Sustainable Agriculture (9th to 12th)
This online textbook, which was developed by the University of Wisconsin Center for Integrated Agricultural Systems, covers sustainable agriculture, field crops, livestock, horticulture, and organic agriculture.
Under the Home (1st to 4th)
Under the Home’s science courses focus on nature study and are based on classic books available in the public domain. Each course includes a printable workbook or field book.
Utah Education Network (3rd to 12th)
UEN offers downloadable textbooks for 3rd through 8th grade science. They also provide earth science, biology, chemistry, and physics for high school. There is a page where you can access online interactive activities for each textbook.
YAPA Kids (1st to 8th)
YAPA Kids provides free online courses taught by live teachers. The courses available may change, and some have a waitlist.
Additional Free Science Resources
This collection of unit studies, lesson plans, and experiment guides can be used to create or supplement a science curriculum.
Students can learn more about science with these websites.
This blog post lists numerous YouTube channels students can use to learn more about a wide variety of science topics.
This blog post lists many resources for virtual science labs, dissections, and simulations.
Explore the world, including many science topics, through virtual field trips.
Christian Liberty Nature Readers (K to 6th) C
This series is based on public domain books which can be downloaded online.
This book is a guide for studying nature with children.
Nature Study: A Pupil’s Text-book (2nd to 6th)
This book provides information for a year-long nature study including information, observation through discovery based questions, sketching, and composition.
Nature Study by Grades (1st to 5th) C
Nature Study by Grades Volume 1 is for grades 1st through 3rd, and Volume 2 is for 4th and 5th grades. These downloadable books provide information, suggestions for activities, and discussion prompts for numerous nature topics. The books were published in the early 1900s and intended for school use, but many of the suggestions will be useful to today’s home educators.
Our Wonderful World (K to 6th) C
The DIY Homeschool has created units to go along with the free nature study eBook, Our Wonderful World. Each unit includes several activities and additional reading.