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How to Make Halloween Monster Eggs

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Halloween experiments are the perfect way to introduce science to kids. Make these Halloween monster eggs and delight your kids with STEM activities!

We are big fans of STEM activities, and this year, we’ve completed an entire series of Halloween STEM Activities with our kiddos. The pickled monster eggs are just one of the many activities we’ve tried, but also one of the simplest.

In particular, 3 year old Bo thought these eggs were amazing. She loved how different the eggs looked once they took their bath in colored water. That’s why we love this experiment as part of our STEM Halloween Activities for Preschoolers.

Halloween experiments are the perfect way to introduce science to kids. Make these pickled monster eggs and delight your kids with STEM activities!

DIY Halloween Monster Eggs Activity for Kids

I think these would not only make a fun Halloween-themed snack for kids, but could also work well as a spooky decoration for any Halloween party. You can also just use them as a fun twist on a STEAM project that kids of all ages will have a blast with.

What you need to make monster eggs

Make sure you have these supplies before starting your monster egg project.

How to Make Halloween Monster Eggs


This activity mixes the science of cooking with color science. Allow kids to explore every step of the process and add their own variations to make it a true STEM activity. 

In this experiment, you can explore how eggs change from liquid to solid while heating, how the colors stain the egg, how the vegetable oil and water have different viscosities, parts of an egg, create an imaginary monster life cycle, and so much more!

Halloween experiments are the perfect way to introduce science to kids. Make these pickled monster eggs and delight your kids with STEM activities!

First, hardboil the eggs. We always boil ours for about 10 minutes.

While the eggs are cooking, make four containers with different colors. We did red, purple, green, and yellow. Drop about 10 drops of food coloring into about 1/2 a cup of water, or just enough to cover each egg.

Smash the eggs a bit to break the shell. This will make the monster pattern on the eggs.

Soak the eggs in the colored water for about 20 minutes.

Remove the eggs and rinse any extra colored water off.

Gently peel the shell off the eggs to reveal the new monster eggs underneath.

Halloween experiments are the perfect way to introduce science to kids. Make these pickled monster eggs and delight your kids with STEM activities!

Place the eggs in your science beaker and cover with vegetable oil.

Ta-da! You now have made monster eggs.

Experiment with different patterns and color saturation and see what amazing creations you come up with!

halloween stem challenge cards

More Halloween STEM Ideas

Halloween Salt Crystallization Experiment

How to make a jello brain without a mold

Diving Ghost experiment

Bat craft

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