Kids Activities Science Science Experiments St Patricks Day

Leprechaun Rocks Science Activity

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This Leprechaun Rocks Science Activity is for kindergarten, first grade, 2nd grade, 3rd grade, 4th grade,5th grade, and 6th grade kids in March for St Patrick’s Day Activities.

Leprechaun Rocks - Outrageously fun Science Activity for Prek, Kindergarten, first grade, 2nd grade, 3rd grade, 4th grade, and 5th grade students St Patrick's Day Activities

Leprechauns are tricky when it comes to hiding their gold. Hiding at the end of the rainbow is not enough. So even if you get to the end of the rainbow, you won’t find a pile of gold. Nope, they would never make it that easy. But if you search about you might discover some suspicious green rocks. With this Leprechaun Rocks Science Activity you will learn the secret science behind how to get the Leprechaun to reveal their gold.

When I told my kids this Leprechaun story they were wide eyed with wonder! They couldn’t wait to uncover the science secret and discover some gold.

This activity is a lot of fun and kids love it. It also incorporates some fantastic fine motor strengthening for your younger children. For a variation on this activity, you can hatch dinosaur eggs.

Leprechaun Rocks Science Activity

Leprechaun Science For Kids FEATURE

Leprechaun Rocks – The Super Secret Science


  • Baking Soda
  • Water
  • Green Food Coloring
  • Vinegar
  • Small syringes (think of the type that come with baby medication) or pipettes
  • Plastic coins
  • Dish soap
  • Large dish
  • Bowl
  • Parchment paper
  • Access to a freezer

You may also want to consider rubber gloves and safety glasses. The vinegar can sting any little owies on the fingers and you definitely don’t want to get it in the eyes.


Science Behind Leprechaun Rocks

This is a traditional baking soda and vinegar reaction that causes the release of CO2. The reaction mixes with the soap which creates a wonderful foam that is a great sensory exploration.

Lephrechaun protecting his rock

Making The Leprechaun Rocks

Start by adding one box of baking soda to a bowl. Carefully add a few drops of green food coloring.

I highly recommend you wear gloves for this part as you will color your hands!

Mix in the green food coloring until the baking soda is evenly colored. Add more as necessary.

Add in a bit of water, just half a teaspoon at a time, and mix until you create a thick paste. It should just start to stick together without crumbling.

Now cup your hand and add a scoop of the paste, place some coins in the middle, then add a bit more paste to cover the coins and shape it like a rock. Place it on the parchment paper.

Once all your rocks are made, place them in the freezer for at least 2 hours so they can set. Note they will look blue when frozen but will turn back to green once the reaction starts.

rock eruption splashing

Revealing Gold!

Once you are ready to do the activity, I recommend draping the area with a plastic cloth, this can get messy!

Place a large dish or bowl on the table, dribble some dish soap in the bottom and place your rock in the dish.

Provide a cup of vinegar and the syringe. Have the child carefully start to squirt the rocks and watch what happens! Continue squirting until all the coins are revealed.

sensory science

Taking the experiment further

The resulting foam and searching through it for the coins and treasures is a fantastic sensory experience, but it does get messy!

Continue adding vinegar and see how much foam you can create!

Lephrechaun science overflow bowl

Then maybe send your Leprechaun for a little swim. He did work hard collecting all that treasure!

Leprechaun Rocks Science Experiments for Kids perfect for March

Even more great chemistry for young scientists!

Kids love these reactions and there are so many exciting variations. A few of our favorites are Bottle Rockets and making Lava Toffee.

Looking for more science?

About the author

Beth Gorden

Beth Gorden is the creative multi-tasking creator of 123 Homeschool 4 Me. As a busy homeschooling mother of six, she strives to create hands-on learning activities and worksheets that kids will love to make learning FUN! Beth is also the creator of where she shares Kindergarten spedicif worksheets,& educational ideas.

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