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3rd Grade Science Fair Project Ideas

Ideas for Grade School Science Fair Projects


Volcanoes are fun, but there are other options for science fair projects.

Volcanoes are fun, but there are other options for science fair projects.

Anne Helmenstine

Introduction to 3rd Grade Science Fair Projects

3rd grade is a great time to answer 'what happens if...' or 'which is better...' questions. Year 3 students are exploring the world around them and learning how things work. The key to a great science fair project at the 3rd grade level is finding a topic that the student finds interesting. Usually a teacher or parent is needed to help plan the project and offer guidance with a report or poster. Some students may want to make models or perform demonstrations that illustrate scientific concepts.

3rd Grade Science Fair Project Ideas

  • Do cut flowers last longer if you put them in warm water or in cold water? You can test how effectively flowers are drinking water by adding food coloring to it and using white cut flowers, such as carnations. Do flowers drink warm water faster, slower, or at the same rate as cold water?


  • Do all students in the class have the same size hands and feet as each other? Trace outlines of hands and feet and compare them. Do taller students have larger hands/feet or does height not seem to matter?


  • Are waterproof mascaras really waterproof? Put some mascara on a sheet of paper and rinse it with water. What happens? Do 8-hour lipsticks really keep their color that long?


  • Do clothes take the same length of time to dry if you add a dryer sheet or fabric softener to the load?


  • Do frozen candles burn at the same rate as candles that were stored at room temperature?


  • Do all types of bread grow the same types of mold?


  • Do raw eggs and hard-boiled eggs spin the same length of time/number of times?


  • What type of liquid will rust a nail the quickest? You could try water, orange juice, milk, vinegar, peroxide, and other common household liquids.


  • Does light affect how fast foods spoil?


  • Can you tell from today's clouds what tomorrow's weather will be?

More Science Fair Project Ideas

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