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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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Would your dog prefer homemade or store-bought food? Raw or cooked? Test your dog's preferred diet in this fun experiment.

Dog Diets: Will a Dog Prefer Homemade Dog Food?

Discover how to make fake snot with this cool science fair project idea to learn about polymers, enzymes, and more.

Making Fake Snot!

What chromosome combinations determine a fetus gender? Use probability to think about whether a sperm and ovum will create a male or female in this project.

Gender Probability: Male and Female Chromosomes

Test whether plants can grow without sunlight and water.

Can Plants Grow Without Sunlight or Water?

This science fair project idea determines which method of hand cleansing is the most effective.

Effective Hand Washing

Kids learn how to prevent erosion by growing grass. They'll test soil with grass against raw soil in this revealing science fair project idea for 4th grade.

How to Prevent Erosion

What are the effects of fertilizer on plant growth? What's the best fertilizer type (solid, liquid or powder)? Kids find out in this science fair project idea.

Best Fertilizer: The Effects of Fertilizer on Plant Growth

Are there really specific taste areas of the tongue for sweet, salty, bitter, sour, and umami? Find out for yourself in this cool science project.

Taste Areas of the Tongue

In this pinto bean germination experiment, you'll learn about how fertilizer aids in growing pinto beans into seedlings.

Pinto Bean Germination Experiment

This science experiment tests if dog saliva can really help heal wounds.

Can Dog Drool Kill Germs?

This science fair project examines how seeds hitchhike on animals and clothing.

How Do Seeds Hitchhike?

Observe corn seed germination to learn about dicots and monocots and how plants grow from seeds to seedlings to full-grown plants!

Corn Seed Germination

This science fair project will help students learn about non-vascular plants, such as mosses.

Water and Mosses

What are buttress roots? In this fun science project, make a model of a rainforest tree and learn how they help trees survive in the tropical rainforest!

Tropical Rainforest Trees: Buttress Roots

Kids build a desert food chain, desert food web, and desert food pyramid in this cool science fair project to learn about trophic levels and consumers.

Desert Food Web

Have you ever noticed the ridges on a dog's nose? In this project, we take several dogs' nose prints and discover just how unique they are!

Dog Nose Prints

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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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