Are you in the market for some science fair project ideas? Well, hopefully this post will have you covered.

These twelve science experiments encourage children to test, tinker with, experiment, hypothesize, and evaluate various properties and phenomena.

Science Fair Project Supplies

Most of our favorite science experiments involve everyday, household supplies because they’re easy to come by and relatively safe for children to use. You’ll see that these science fair project ideas use materials like gummy bears, dish soap, food coloring, chocolate syrup, sand, lemons, eggs, celery, oil, Alka Seltzer, vinegar, plastic bags, pencils, salt, cotton balls, seeds, and candy.

You can find a complete list of our recommended science project supplies here, where you’ll find our favorite beginner microscope, kids’ safety glasses, and pipettes.

Links to each of the science fair projects can be found below the block of photos. This post contains affiliate links.

Growing Gummy Bear Experiment, TinkerLab

Elephant Toothpaste, Preschool Powel Packets

Kitchen Science: What Will Freeze First?, No Time for Flash Cards

Make Magic Sand, Paging Fun Mums

Sink or Float Lemons, One Perfect Day

Crystal Egg Geodes (and the must-have ingredient for this project), TinkerLab

Make a Lava Lamp, Hands on as we Grow

Colorful Celery Experiment and Capillary Action, TinkerLab

Melting Ice Experiment, The Chaos and the Clutter

Magical Plastic Bag Experiment, TinkerLab

Grow Beans on Cotton Balls, The Imagination Tree

Dissolving Peeps Experiment, Mom to 2 Posh Lil Divas

Bonus: 10 Tips for a Fab Science Fair Board

Thanks to Handmade Kids Art for the excellent article on how to create a successful science fair board: 10 Tips for a Rockstar Science Fair Board

More Engaging Science Projects and Experiments

Click here for our extensive list of biology, engineering, technology, physics, geology, and chemistry projects for young children that are easy, fun, and kid-tested.

30 Fun Science Projects for Kids is our go-to list for summer fun, science exploration, and inventive thinking.

Which of these have you tried?

If you’ve tried any of these science fair project ideas, would you leave a quick comment? I know that our other readers would love hear about your experiences.

And, if you have a favorite science fair project that’s not listed here, will you share it in a comment? We’d love to make this a valuable resource for our readers like you!