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Third Grade Science Fair Project Ideas

Great selection of third grade science fair project ideas. These science fair projects can help you find third grade level ideas for your science fair.

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This science fair project teaches students the differences between fruits and vegetables.
Is it a Fruit or a Veggie?
Third Grade
Elementary School
Young scientists will investigate people's preferences for saltiness, and make some inferences about genetics and diet.
Too Much Sodium?
Third Grade
Easy
In this science fair project, students will use the streak test to tell minerals apart from each other.
Streak Test: A Way to Tell Minerals Apart
Third Grade
Elementary School
In this popcorn experiment, students can explore how two things made out of the same material can have very different appearances and densities.
Popcorn Pumice: Exploring Different Rock Densities
Third Grade
Fourth Grade
This science project lets students explore the number of spots on a ladybird and how to treat ladybugs with respect.
Where Did the Lady Bug Get Her Spots?
Third Grade
Elementary School
In this science fair project, you'll make a 'ghost' appear in a test tube, and learn about what happens when hot water and cold water interact.
The Ghost in the Tube
Third Grade
Elementary School
Most people assume that cold water freezes more quickly, but could that be false? Does hot water freeze faster than cold water? Let's find out!
Does Hot Water Freeze Faster Than Cold Water?
Third Grade
Physics
Did you even wonder why some rocks are round and smooth while others are broken up into small pieces? Maybe you've even discovered a rock in your backyard that's made up of several layers. If so, you've…
Crayon Rock Cycle Experiment
Third Grade
Geology
What's the best way to make DIY compost? Kids will learn about aerobic and anaerobic decomposition while learning to appreciate the value of composting.
DIY Compost
Third Grade
Hard
In this science fair project, we'll use a liquid crystal thermometer to find out whether exercising makes a difference in people's temperature.
Warm, Warmer: How Does Exercise Change Body Temperature?
Third Grade
Second Grade
Learn whether Mylar Balloons last longer than Latex Balloons or vice versa.
Mylar vs. Latex Balloons
Third Grade
Fourth Grade
Science fair project which determines what types of foods ants like to eat, by monitoring the lives of ants in a colony.
What Does an Ant Eat for Breakfast?
Third Grade
Fourth Grade
In this experiment you will replicate the mummification process by making a hot dog mummy.
Hot Dog Mummy
Third Grade
First Grade
Did you ever add salt to pasta? Did it help cook the pasta faster? If not, find out in this science fair project idea.
Does Adding Salt to Pasta make it Cook Faster?
Third Grade
Fourth Grade
In this experiment, kids will see if pruning tomato plants makes them more fruitful and learn about the factors that contribute to a plant's fruit production.
Pruning Tomato Plants
Third Grade
Botany

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