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Top 100 Science Fair Projects

Heidi Reina, M.S., Ed, is an educational technology integrator and teacher, reviewing free educational websites and apps.

Image of "What puts the 'pop' in popcorn?" science fair project, courtesy of woodleywonderworks, under Creative Commons 2.0 license.

Image of "What puts the 'pop' in popcorn?" science fair project, courtesy of woodleywonderworks, under Creative Commons 2.0 license.

Free Science Projects for Elementary, Middle and High School

Get a fast start and some great ideas with these 100 science fair projects. Whether you're gearing up for the school's annual science fair or a city-wide or state-wide competition, these projects are an excellent starting point.

They also make wonderful summer projects to keep your kids engaged with science in a fun way. I've recommended many of them to my students. My daughter has done quite a few of them, and won a couple of awards.

The best feature of these projects - they provide detailed instructions.

Also be sure to check out tips from for kids to create a great science fair project.

If you have a link to a good science fair project, please add it in the comments section below.

These suggestions are moderated to ensure that items added are free, high-quality science project instructions. Please note that many of the projects require the purchase of supplies or equipment to accomplish them. So as you help your child select a project, keep in mind the cost and availability of materials.

My Favorite Science Project Sources

    This one is at the top of my sources list because of its Free Topic Selection Wizard, step-by-step instructions, and Ask an Expert discussion board.
    Tons of detailed projects for all grade levels.
    This is one of the oldest, most established sources of projects. Though the site's look is a bit dated, there are many excellent project ideas here.

Without Further Ado, the List!

Image of a local science fair in New York, courtesy of  Stilfehler, under Creative Commons 3.0 license.

Image of a local science fair in New York, courtesy of Stilfehler, under Creative Commons 3.0 license.

What's your favorite science?

Does your kid prefer to do experiments that involve plants and animals? Or skateboard physics? Or computers and statistics? Let's find out what science areas interest our readers most.

What was your favorite (or most disastrous) science fair project in school?

bob on February 01, 2016:

it was awesome

googoo on October 17, 2015:

omg this is awesome

ScienceLover158 on September 19, 2014:

I don't know how to come up with a prodject can you help me.

AnonymousC831 from Kentucky on April 16, 2014:

Scroll to Continue

I enjoyed your lens.

Tanya Jones from Texas USA on February 17, 2014:

I confess, I don't have kids. I answered the poll according to my inner child, however. :D I'm glad I found this. I'm writing a book in which several characters do a science fair project and I'm at a loss. Their project will incorporate the strengths of each member of their small group. Thank you.

cleansweeping on February 05, 2014:

I love this site!!!!

OUTFOXprevention1 on March 11, 2013:

I used glo germ and it was awesome. We actually sponsor students once in a while who request it for science fairs! Thanks for sharing.

Suko on January 26, 2013:

Why didn't I think to look here when my kids needed to come up with science projects?! This lens is FABULOUS; it is a helpful resource to students of science--and their parents!

Heidi Reina (author) from USA on January 20, 2013:

@anonymous: there are recipes online to use instead of agar, made from gelatin and sugar or yeast. and one inventive 13-year-old came up with the idea to use large bubble wrap instead of petri dishes. cut the tops off the bubbles and pour your agar substitute in a strip of 4 or five bubbles. just be sure to wash everything you use with hot soapy water first including the scissors or knife. as for the bacteria, get yourself a some q-tips and gather sample from your bathroom, kitchen, doorknob... the list of places to find bacteria is endless.

anonymous on January 20, 2013:

@anonymous: where did u get the materials? (the petri dishes ,e.coli bacteria...ext..) i coudnt find them except online and i don't have time to get them online

can u help me plzzzz?!!

anonymous on November 29, 2012:

@srsddn lm: iam useing this for a project

srsddn lm on November 10, 2012:

Thanks for sharing such a valuable resource. I am sure my son will make use of it.

anonymous on October 31, 2012:

the garlic exp. was great!!!!!!!!!!:-)

anonymous on October 29, 2012:

Great resource! Thanks :)

anonymous on October 15, 2012:

the city water supply. a great model to make

anonymous on October 15, 2012:

interesting lens very helpful for my brother

anonymous on October 11, 2012:

bridge experiment what a superb.

anonymous on July 29, 2012:

What a great challenge and inspiration for scientific minds!

bbsoulful2 on July 22, 2012:

I did a great experiment on micronutrients and sunflower growth. Funny thing is, I think I left it in my locker when I graduated...

Angela F from Seattle, WA on March 21, 2012:

I can't remember what it was supposed to be - all I remember was HCL and seashells smell really really bad! Awesome lens!

waldenthreenet on February 29, 2012:

congrads on your Squidoo trophy. Am gong for next. Conversations help. Thanks.

AlphaChic on February 12, 2012:

The egg drop, definitely :)

dwnovacek on January 15, 2012:

Great resource, nicely presented. Angel Blessed!

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