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Marshmallow Science Fair Projects for Elementary

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If you love marshmallows, you’ll love this list of marshmallow science fair projects that kids can enter into their school science fair so add them to your list of science fair project ideas right now!

After Christmas and the big holiday rush is over, you know what I’m left with?

Stale marshmallows.

I don’t want to waste them, but no one in my family likes to eat stale marshmallows. But I feel so wasteful when I throw them out! Enter marshmallow science fair projects. 

These science fair projects are the perfect way to use stale marshmallows and help kids learn something at the same time! Marshmallows have never been this educational before.

If you love marshmallows, you'll love this list of marshmallow science fair projects that kids can enter into their school science fair!

Parts of a Science Fair Project

Each school will have varying rules for their projects, but in general, most science fair projects must include:

A hypothesis.

Research.

Investigation with variations and a control group.

Record of results.

All science projects start with open ended questions,  such as, “what will happen if…?”

What You Need for a Science Fair

You’ll want to have these supplies on hand before doing your science fair project. Shop the included Amazon storefronts to make things easier and don’t forget to download the free science fair planning checklist before getting started!

Science Fair Project Planning

When you’re planning your project, you want to keep everything organized. Click the image below to get my free science fair project checklist so you can start organizing your project from the start.

You may also want to check out this list of science fair project research supplies.

Supplies for a Science Fair Project

There are so many supplies for science fair projects that are individual to each project, but if you want a general list of possible supplies and inspiration for your project, check out my selection of science fair experiment supplies on Amazon.

Supplies for a Science Fair Presentation

Your science fair presentation is important! It should look presentable and eye-catching. Check out this list of my favorite science fair presentation supplies.

science fair display board example

Marshmallow Science Fair Projects- A Fantastic Way to Use Old Marshmallows

Try these adorable and simple marshmallow science fair projects and not only will you use up those old marshmallows, but your kids will learn something along the way, too!

My kids love learning about scientific principles and exploring the scientific method using everyday items around the house.

Marshmallows are the perfect tool for learning about density, Boyle’s law, blood cells, engineering, and more!

If you love marshmallows, you'll love this list of marshmallow science fair projects that kids can enter into their school science fair!

Marshmallow Density Experiment

Dissolving Peeps Science Experiment

Blood Cell Science Experiment

If you love marshmallows, you'll love this list of marshmallow science fair projects that kids can enter into their school science fair!

Solar Powered Marshmallow Melter Experiment

Effects of Liquids on Marshmallows Experiment

Boyle’s Law Science Experiment

Expanding Marshmallows Science Experiment

If you love marshmallows, you'll love this list of marshmallow science fair projects that kids can enter into their school science fair!

Marshmallow Shooter Science Experiment

Marshmallow Boat Building Challenge

What Can a Marshmallow Absorb?

science fair display board example

More Fun Science Fair Project Ideas

If you love science and STEM but don’t like hunting for supplies, we love the Mel Science kits. They have options for elementary and middle school, and each kit comes with all the supplies needed for each experiment!

Try these fun science fair project ideas when you’re finished exploring marshmallow science fair projects.

Candy Science Fair Projects

Classic Science Fair Projects

Active Science Fair Projects

Save this idea for later so you don't forget to use it!