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.'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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In this experiment, young ecologists will learn about a type of edge effect: how trees and plants at the edge of a forest can act as a weed filter.
Fourth Grade
Prove that the Earth is not flat. The objective of this science fair project is to measure the angle of the sun and calculate the circumference of the Earth.
Fourth Grade
Earth & Space Science
This science project teaches students the relationship between compost and plant growth. Students conduct an experiment with different types of compost.
Fourth Grade
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
The goal of this project is to create an exciting topographical map out of dough.
Fourth Grade

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