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Fourth Grade Science Fair Project Ideas

Building off of what they learned in 3rd grade, 4th graders add a new level of sophistication to their 4th grade science projects. In addition to describing data quantitatively, kids begin to use their observations to formulate scientific arguments and engage in scientific debate. 4th grade science fair projects may involve kids going beyond testing a hypothesis—young scientists can be encouraged to use their results to make predictions about what might happen when the experiment is expanded to test new variables. Education.com's selection of fourth grade science fair project ideas are carefully written with 4th graders in mind, giving them the tools they need to effectively learn about the world around them by pursuing the answers to their questions in a methodical way.

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This science fair experiment idea's objective is to understand the general concept of an acid and a base.
Fourth Grade
Elementary School
How clean is the air we breathe? The answer might surprise you. Learn how to investigate local air quality with this cool science fair project.
Fourth Grade
Ecology
Science fair project idea that examines different physical characteristics of a chosen animal. Make educated guesses about evolution based on animal's form.
Fourth Grade
Elementary School
Future engineers, unite! Discover how to keep a sandcastleâs bridge from falling
into the moat.
Fourth Grade
Engineering
Check out this cool science project idea to learn about rocks and explore the cycles of formation, breakdown, and reformation of rocks in the Earth's crust.
Fourth Grade
Elementary School
In this fun science fair project idea learn about universal solvents and solutes and find out the solubility of several common liquid substances.
Fourth Grade
Elementary School
This science experiment tests whether warm or cold water works best in making cut flowers last longer.
Fourth Grade
Elementary School
Free science fair project idea that examines the differences between cats and dogs. Analyze objective qualities rather than subjective ones.
Fourth Grade
Elementary School
This science fair project idea explores the egg's thin membrane.
Fourth Grade
Elementary School
Ever wonder why refrigerator lights turn off when you close the door? Does the darkness prevent food from spoiling? This experiment, determines just that.
Fourth Grade
Elementary School
This science fair project idea explores how enzyme inhibitors, active sites, non-competitive enzyme inhibitors, and substrates work.
Fourth Grade
Elementary School
This science fair project teaches students about wilting and browning of salad greens.
Fourth Grade
Kindergarten
The science project fair idea explores the interaction between your nose, mouth, and brain when tasting a new food or drink.
Fourth Grade
Elementary School

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