Written by Looking for fun and easy Halloween science experiments for kids? These FREE printable Halloween science activities are perfect for bringing a little spooky science into your home or classroom this Halloween!
From bubbling, fizzy potions and creepy density jars to pumpkin lava lamps, balloon-powered pumpkins and spooky optical illusions, there are lots of easy, hands-on science experiments to encourage kids to think like real scientists. Each activity comes with a printable instruction sheet and uses only basic materials, so you can get started straight away.
Whether you’re planning Halloween activities for school, looking for a fun half-term project or simply want to add some science to your spooky celebrations, you’ll find plenty of ideas to keep little hands busy and curious minds engaged.
Download the free Halloween science experiment booklet at the end of this post and get ready for some seriously spooky science fun!
You might also like my creepy ( but simple ) Halloween STEM Challenges.
Printable Halloween Science Experiments
The experiments can be printed individually, or you can find the full booklet containing all the activities at the end of this post.
Fizzy Potions
Create your own spooky, fizzy potion. This is even better if you go for a walk to find a great stirring stick first! I also have a blank version of the recipe so children can write their own potion recipe for Halloween.
Optical Illusion
Optical illusions are a great activity for any time of year, but these pumpkin illusions are my favourites. You can either draw your own or use my handy template.
Density Jar – FREE Halloween Science Experiment Printable
To keep this Halloween density jar simple, use water and cheap cooking oil, and then try to find a spooky object to float on each layer.
Pumpkin Lava Lamp
Pumpkin lava lamps make a brilliant window decoration and can be used over and over again. They are also a great way to learn about density and chemical reactions. The oil sits on top of the water layer as oil has a lower density than water.
Blow up a (Balloon) Pumpkin
Blowing up a pumpkin balloon is a great science investigation, as you can experiment with different methods of creating the gas that inflates the balloon. Experiment with different amounts of baking soda and vinegar, yeast and warm water or even an effervescent vitamin tablet.
Halloween Crafts for Kids
After you’ve finished experimenting, try some of these simple Halloween crafts.
Crafts on Sea has a beautiful pumpkin suncatcher.
Red Ted Art has some super cute origami bats.
These Frankenstein paper plates are lovely from Simple Everyday Mom.
Can you think of any more Halloween activities for us?
If you still haven’t found what you’re looking for, check out my complete list of Halloween science experiments for kids!
Last Updated on October 22, 2026 by Emma Vanstone
The post FREE Printable Halloween Science Experiments for Kids appeared first on Science Experiments for Kids.
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