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4th Grade Science Fair Project Ideas

Ideas for Grade School Science Fair Projects


Science projects can be fun as well as educational.

Science projects can be fun as well as educational.

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Introduction to 4th Grade Science Fair Projects

Great 4th grade science fair projects involving answering a question, solving a problem, or testing a hypothesis. Usually a teacher or parent helps work out the hypothesis and design the project. 4th graders have a good understanding of scientific concepts, but may need help with the scientific method and organizing a poster or presentation. The key to a developing a successful project is finding an idea that is interesting to a 4th grader.

4th Grade Science Fair Project Ideas

  • Do cockroaches have a preference for direction? Catch and release cockroaches. Which way do they go? Is there a common trend or not? You can try this project with ants or other crawling insects.


  • Does magnetism travel through all materials? Put different materials between a magnet and metal. Do they affect how strongly the magnet is attracted to the metal? If so, do they all affect the magnetic field the same amount?


  • Will seeds germinate if you soak them in a liquid other than water? You can try milk, juice, vinegar, and other common household liquids. Alternatively, you could see if plants will grow if they are 'watered' with liquids other than water.


  • How much salt (or sugar) can a plant tolerate? Water plants with different solution of salt or sugar. How high of a concentration can the plant tolerate? A related question would be to see if plants can survive if they are watered with soapy water, like leftover dishwater.


  • Do birds have a preference for birdhouse material? In other words, do they seem to care if the birdhouse is made from wood or plastic or metal?


  • Do worms react when exposed to light? Do worms react differently to different colors of light?


  • Do ants prefer different types of sugar? Different types of sugar are found in table sugar, honey, maple syrup, and molasses.


  • Can you taste the difference between foods that contain fat and fat-free versions of the same product?


  • Do white candles and colored candles burn at the same rate?
More Science Fair Project Ideas
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