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Watch a pumpkin decompose and then regrow with this fascinating Halloween experiment. These candy experiments are perfect for October when there’s candy a-plenty. It’s a great way to use leftover candy after the holiday, too. Either way this floating drawing STEM activity is sure to impress!

It’s a cartesian diver experiment with a festive Halloween twist. Watch the dancing ghost as it moves up and down in the bottle or jar, seemingly on its own. Learn about mummification with this neat science project. You’ll compare and contrast various desiccants to see which is most effective. Build a candy catapult to launch some of your Halloween candy into the air! It’s a captivating way to learn about potential energy and kinetic energy.
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You may have tried the warm water and Skittles experiment before, but this one has a lovely pumpkin-themed twist. Use green and orange Skittles to outline a pumpkin shape, add the warm water, and watch the colors bleed to make a beautiful pumpkin. Integrating science activities and sensory activities into the preschool classroom (and at home!) can be seriously fun for everyone involved. That, alone, is reason enough to do these activities in my opinion.
Have some fizzy fun with these fizzy rocks with hidden bugs inside. This is a great one for kids who love baking soda eruptions. Make creepy frozen hands and time how long they take to melt Can you speed up the melting? Try adding salt or warm water and watch what happens.
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Kids will love making their own puking pumpkin for Halloween with a few simple household ingredients. These pumpkin lava lamps make a great alternative to carving a pumpkin. The best thing is you can use them over and over again! Just add an effervescent vitamin tablet or alka seltzer when you want them to erupt. This would be great to give out in small tubs as an alternative to candy. Try making some bubbly witchy drinks while investigating which make the best bubbles.
As an extension activity you could make a whole street. Try a dancing ghost like Inspiration Laboratories or jumping ghosts to learn about static electricity. You can use that natural excitement to encourage your students to learn more with Halloween STEM for little learners. I couldn’t help myself and had to add even more ideas to try with the children for Halloween. For more information or inspiration, check out our blog or reach out to us today to get started on a comprehensive science lesson plan you and your students will love.
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Be sure to check out my Halloween Pinterest board for even more ideas. You’ll receive all the supplies needed to make 24 shaker cups filled with Vampire Slime. It’s the most original take-home party favor you’ve ever seen. You’ll also learn how to make color-changing vampire veins that are guaranteed to make your guests scream with delight. Finally, you’ll learn how to capture a spooky, glowing image on a piece of phosphorescent paper using a battery-powered black light wand. Learn how to make homemade slime, explore how ice melts, blow bubbles, try fizzy eruptions all using ingredients or supplies found in your kitchen or pantry.
This activity could be both budget-friendly and fun for the entire class. We’ve put together eight ideas you can use in your science classes that can be adjusted for any aged goblin or ghoul as you teach through the different branches of science. I don’t want to alarm you, but you might find eyes in your slime. We tried something different around here and made a Peeps Candy Halloween slime. Do some fun play in the bathroom sink with Messy Science Witch’s Brew from The Golden Gleam.
Halloween Sensory Science
Grab some packing peanuts for this spooky science project! You’ll decorate the packing peanuts like skulls, add them to water, and see what happens. Another fun variation is to try dissolving them in different liquids. If you’d rather not mess with dry ice, have your students measure density of different “potions” instead. Get some different liquids add some food coloring, and have them measure the density of each liquid. Once they are done they can figure out the order of the layers to make a density column.
Check out this quick and easy lab from the science spot where students learn about blood spatter patterns. Pair a fun pumpkin book with a rotting pumpkin experiment for all things Halloween science. Iconic Halloween candy mixed with simple STEM activities for a cool Halloween STEM experience you can set up quickly. Below to read more about how to do each Halloween science experiment or STEM activity. If you have got some dry ice around this Halloween, gather your friends and family and try making a Dry Ice Bubble Sphere.
Ready for toil and trouble with leftover vinegar from the monster egg experiment? As another physical science activity, core your apples, add vinegar and then watch as the apples begin to bubble and boil. Add food coloring to make it look like a witch’s brew or apple spice for a delightful smell. Preschoolers will love watching this fun Halloween science experiment.
Purchase one or two large glowing light-sticks per pumpkin at a party store or hardware store. Place your pumpkin outside on Halloween night and admire the “Oooos” and “Ahhhhs” of Trick-Or-Treaters. Once all the Halloween fun is over why try some of these easy ideas to help use up spare pumpkins. Use pumpkin erasers for a fun Halloween themed STEM stacking challenge. Check out the list below for some items perfect for a spooky good time exploring science and the senses. I’m going to stop there and get down to the awesome Halloween sensory and science activities.
It’s easy, and the result will wow anyone at your party. If you want to make LOTS of classic slime as an activity for a party or science lesson, or if you have trouble finding Borax, a kit is the way to go. You can find some great slime making kits by clicking HERE. Scare your friends with some creepy mirror writing and a super spooky noise maker.
Use your leftover Halloween candy to do over 25 candy math and science activities. Halloween is the perfect time for oozing, bubbling and eye-catching science. If you love to perform science demonstrations, Halloween is a wonderful excuse to fill that cooler with dry ice and get ready for a fun-filled day filled with “ooze” and ahhhs! Check out our dry ice demonstrations and instructions to create a spook-tacular Halloween. Brew up a fun potion with this witch’s brew experiment.
Turn off the lights and watch our Atomic Slime and Atomic Slime glowing worms glow. Or, write your very own hidden messages and make scary Halloween sounds. Halloween is the perfect time to play around with fun science experiments like making slime and exploding pumpkins. We think Halloween tops the chart for cool ways to explore science and STEM all month long. From gelatin hearts, to wizards brew, erupting pumpkins, and oozing slime, there are tons of spooky science experiments to try.
Make fizzy potions with fruit juice inspired by Room on the Broom by Julia Donaldson. I often find that some of the students’ favorite activities in preschool revolve around science and the senses. And since your students will be participating in so many of the science and sensory activities listed above, you’ll need to keep lots of quality supplies on-hand. Color Mixing Experiment Kit for KidsArt and science come together in the Steve Spangler Color Mixing Kit.