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20+ Halloween Science Experiments Kids Will Love

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October is one of the best months of the year.

Not only does the tempature start to drop, but October kicks off the hoiday season, with one of the best holidays ever, Halloween!

Halloween is the perfect time to explore the grosser, creepier, and spookier side of Halloween STEM.

Halloween science experiments are truly memorable, and provide tons of educational value for kids!

Halloween science is the perfect way to bring science and scary together! Kids will love these creepy science experiments. #scienceexperiments #science #halloween #halloweenactivities #stemactivities

Easy Halloween Science Experiments for Elementary Students

Love Halloween? Love science? Then you’ll love these creepy science experiments for Halloween.

You don’t have to be a scientist to do these fun science activities at home with your kids.

These Halloween science experiments work for at home, at a Halloween party, and in the classroom to make your elementary science experiments a bit more fun!

Each of these Halloween experiments can be adapted for a wide variety of ages, from kindergarten all the way up to middle school!

What are the benefits of Halloween science projects?

halloween stem challenge cards

Why are kids fascinated with all things spooky, gross, and creepy?

It’s definitely hard to say, but Halloween is the perfect time to take advantage of this fascination.

Kids will love learning about the science behind their favorite creepy experiences and Halloween is also a fun time to give a Halloween or spooky twist to any traditional science experiment.

Why just make a baking soda and vinegar reaction when you can turn it into a mad scientist’s lab?

Or why make a regular leakproof bag science experiment when you can turn it in to creepy brain surgery?

With a bit of imagination, Halloween science is the best science of all!

If you love Halloween and you love science, you’ll have a blast with these spooky Halloween science activities. Halloween STEM activities are the perfect way to learn about science, technology, engineering, and math during the Halloween season! #scienceexperiments #science #halloween #halloweenactivities #stemactivities

If you love Halloween science, don’t miss this list of Halloween slime recipes!

What do kids learn doing Halloween science experiments for the classroom?

These Halloween science experiments teach chlidren about a variety of scientific concepts including:

  • Density
  • Molecules and atoms
  • Bacteria and mold growth
  • Molecular bonds
  • Chemical reactions
  • Physics
  • Osmosis
  • Anatomy
  • Properties of matter
  • And more!

You just might be surprised how much science there is to learn within the realm of Halloween science activities!

These spooky Halloween science experiments are the perfect way to mix Halloween with science! Spooky science experiments have never been this fun before! #scienceexperiments #science #halloween #halloweenactivities #stemactivities

Don’t miss the complete list of Halloween STEM activities. 

What to include in a Halloween science activity:

All Halloween science demonstrations should contain four parts:

Get spooky this Halloween with these spooky science experiments! These gross science experiments and creepy science experiments are the perfect way to celebrate the strangest holiday of the year. #scienceexperiments #science #halloween #halloweenactivities #stemactivities
  • A question or hypothesis.
  • A test or experiment.
  • The recording of data.
  • A re-test with additional varaibles.

Include these four elements in your science experiments to make them true experiments, rather than just science demonstrations.

halloween stem challenge cards

Supplies for Halloween science:

EZ BioResearch Bacteria Science Kit (IV): Top Science Fair Project Kit. Prepoured LB-Agar Plates And Cotton Swabs. Exclusive Free Science Fair Project E-Book Packed With Award Winning Experiments.EZ BioResearch Bacteria Science Kit (IV): Top Science Fair Project Kit. Prepoured LB-Agar Plates And Cotton Swabs. Exclusive Free Science Fair Project E-Book Packed With Award Winning Experiments.EZ BioResearch Bacteria Science Kit (IV): Top Science Fair Project Kit. Prepoured LB-Agar Plates And Cotton Swabs. Exclusive Free Science Fair Project E-Book Packed With Award Winning Experiments.Corning Pyrex #4980 Erlenmeyer Narrow Mouth, Glass Flask Set - 5 Sizes - 50mL, 125mL, 250mL, 300mL, 500mLCorning Pyrex #4980 Erlenmeyer Narrow Mouth, Glass Flask Set – 5 Sizes – 50mL, 125mL, 250mL, 300mL, 500mLCorning Pyrex #4980 Erlenmeyer Narrow Mouth, Glass Flask Set - 5 Sizes - 50mL, 125mL, 250mL, 300mL, 500mLSuperlady 18pcs 20x150mm 36ml glass test tube with Wooden stopper for scientific experiments, party, decorate the house, candy storageSuperlady 18pcs 20x150mm 36ml glass test tube with Wooden stopper for scientific experiments, party, decorate the house, candy storageSuperlady 18pcs 20x150mm 36ml glass test tube with Wooden stopper for scientific experiments, party, decorate the house, candy storagePyramex S4110SMP Intruder Safety Glasses (12 Pack), Clear Lens with Assorted Temple ColorsPyramex S4110SMP Intruder Safety Glasses (12 Pack), Clear Lens with Assorted Temple ColorsPyramex S4110SMP Intruder Safety Glasses (12 Pack), Clear Lens with Assorted Temple ColorsDelta Education Metal Tweezer, 4Delta Education Metal Tweezer, 4Delta Education Metal Tweezer, 4Be Amazing Toys Big Bag Of Science +70 ActivitiesBe Amazing Toys Big Bag Of Science +70 ActivitiesBe Amazing Toys Big Bag Of Science +70 Activities

Our favorite Halloween science books:

Grab these Halloween science experiment books if you need more ideas!

Grossology: The Science of Really Gross ThingsGrossology: The Science of Really Gross ThingsGrossology: The Science of Really Gross ThingsOh, Ick!: 114 Science Experiments Guaranteed to Gross You Out!Oh, Ick!: 114 Science Experiments Guaranteed to Gross You Out!Oh, Ick!: 114 Science Experiments Guaranteed to Gross You Out!Bugs: A Stunning Pop-up Look at Insects, Spiders, and Other Creepy-CrawliesBugs: A Stunning Pop-up Look at Insects, Spiders, and Other Creepy-CrawliesBugs: A Stunning Pop-up Look at Insects, Spiders, and Other Creepy-CrawliesThe Mason Jar Scientist: 30 Jarring STEAM-Based ProjectsThe Mason Jar Scientist: 30 Jarring STEAM-Based ProjectsThe Mason Jar Scientist: 30 Jarring STEAM-Based Projects

READY TO GO HALLOWEEN SCIENCE KITS

If you’re short on time, try ordering one of these Halloween science kits!

Playz Disgusting n' Gross Zombie Farts, Boogers, & Bloody Slime Science Activity & Experiment Set - 34+ Tools to Make Levitating Eyeballs, Gizzards, Fart Putty & Boiled Boogers for Boys & Girls Age 8+Playz Disgusting n’ Gross Zombie Farts, Boogers, & Bloody Slime Science Activity & Experiment Set – 34+ Tools to Make Levitating Eyeballs, Gizzards, Fart Putty & Boiled Boogers for Boys & Girls Age 8+Playz Disgusting n' Gross Zombie Farts, Boogers, & Bloody Slime Science Activity & Experiment Set - 34+ Tools to Make Levitating Eyeballs, Gizzards, Fart Putty & Boiled Boogers for Boys & Girls Age 8+Scientific Explorer Disgusting Anatomy BrainScientific Explorer Disgusting Anatomy BrainScientific Explorer Disgusting Anatomy BrainHalloween Idea - ZOMBIE PLANT GROW KIT- (Touch It and It PLAYS DEAD!) Unique Nature Kit- Grow a Fun Interactive House Plant that Plays DEAD when Touched & Comes back to life in Minutes!Halloween Idea – ZOMBIE PLANT GROW KIT- (Touch It and It PLAYS DEAD!) Unique Nature Kit- Grow a Fun Interactive House Plant that Plays DEAD when Touched & Comes back to life in Minutes!Halloween Idea - ZOMBIE PLANT GROW KIT- (Touch It and It PLAYS DEAD!) Unique Nature Kit- Grow a Fun Interactive House Plant that Plays DEAD when Touched & Comes back to life in Minutes!Ghost Science KitGhost Science KitGhost Science KitHalloween Science PartyHalloween Science PartyHalloween Science Party

Now, let’s get to the creepy science experiments!

Halloween Science Experiments for the Classroom

Halloween Science Experiments for the Elementary Classroom

Bring the spooky science of science to life this Halloween with these spooky Halloween science experiments for kids!

halloween stem challenge cards

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