Welcome Spring with this St Patrick’s Day STEM challenge countdown! You might wonder, why I put so much emphasis on holiday activities… Kids love to learn but not always by doing the same exact activity again and again.   Do something different this season with fun science experiments and a holiday theme!   Our St Patrick’s Day activities are themed twists on classic STEM activities.


St Patricks Day STEM Activities and St Patricks Day Science Experiments and Activities. Also learn how to make St Patricks Day slime recipes for kids

If you love themed holiday activities as we do, these St Patrick’s Day science and STEM activities will be a big hit.  One day my son probably won’t care about themed activities, so I am going to enjoy these days while I have them!


STEM takes science and builds in elements of technology, engineering, math, and sometimes even art.  A good STEM activity will include at least two of these four pillars such as math and engineering or science and technology.

Amazingly, STEM activities are perfect for young kids because they provide so many valuable life lessons and skills such as observational skills, critical thinking skills, and design skills. STEM also provides a much-needed dose of failure before success. Perseverance and patience!


Why not?  Who doesn’t love the magic of rainbows, leprechauns, and pots of gold!  You can keep STEM activities fresh all year long by adding fun themes along the way.

Adding holiday specific colors (like green and gold and rainbow) and accessories (gold coins and little black pots or shamrock confetti) allow your kids multiple opportunities to practice the basic concepts over and over but with a unique twist. I have always found that kids love these ideas.

However, we do love holidays around here, maybe a little too much, and these St Patrick’s Day ideas will be a big hit. Make slime, explore eruptions and chemical reactions, build leprechaun traps, and so much more!


Looking for easy to print activities, and inexpensive problem-based challenges? 

We have you covered…

St Patricks Day STEM Challenge Cards


Below you will find a mix of classic experiments, activities, and challenges that have been recreated with a St Patrick’s Day theme.

These St Patrick’s Day activities will keep you busy this Winter, almost Spring.  I list the general supplies needed for each activity to make it easy to prepare. I love to start out our countdown STEM activities with a themed Tinker Tray (look below).

Tinker trays are awesome for open-ended inventing and engineering. Leave out a themed tinker tray for the season and your kids will have a screen-free activity available to use any time!


We have awesome and easy slime recipes including fluffy slime, saline solution slime, borax slime, and liquid starch slime. Make a crystal clear confetti slime, a rainbow of slime, a fluffy green slime, gold slime, and a bunch more! Watch a cool video of slime being made too!

St Patrick’s Day Fluffy Slime

Leprechaun Slime

Green Glitter Slime

Rainbow Slime

Rainbow Slime Swirl

How To Make Slime for St Patricks Day activities with Kids


 Leprechaun Trap Ideas

Bring out the recyclables and the LEGO, and build a Leprechaun Trap.   We have a printable planning page too! If you don’t have LEGO use any materials from the recycling bin. A leprechaun trap is an easy St Patrick’s Day STEM challenge for kids of multiple ages!

St Patricks Day Kids Leprechaun Trap Ideas


Fizzing Rainbow Pots

Classic baking soda and vinegar chemical reaction in a rainbow of colors.   Black pots, food coloring, baking soda, and vinegar.

fizzy pots for St patricks Day science and STEM

Fizzing Leprechaun Gold Hunt

Another fun baking soda experiment with a gold coin hunt included! We also made baking soda dough. Supplies needed black pots, gold coins, baking soda, vinegar, and gold glitter.

St Patricks Day Baking Soda Science Gold Coins Activity

Grow Shamrocks

Awesome chemistry for kids!  Watch borax crystals grow overnight on these pipe cleaner shamrocks and learn about saturated solutions and crystal formation.

Rainbow Crystals

Make a simple rainbow from pipe cleaners and grow your own crystal rainbow.

rainbow for St Patrick's Day

Rainbow In A Jar

Test the density of water and make a rainbow with this experiment.  You will need sugar, water, food coloring, straw, and a tube or narrow vase.

Sugar water density science and rainbow science activity

Color Changing Flower Experiment

Have you ever tried to change the color of a flower? Make your own green carnations for St Patricks Day STEM! White carnations, green food coloring, vases or jars, and water.

Color Changing Flower Science Experiment for Kids Spring STEM

Skittles Experiment 

Leprechauns love skittles!  This is an easy to set up science activity that gets really cool results!  You will need skittles, water, shallow pan or dish.

How About a Skittle Taste Test?

Taste the rainbow. Do a blind taste test and use your senses to pick out the flavors. Skittles needed!

Click below to get your quick and easy STEM challenges. 

A variety of new activities, which are engaging but not too long!

St Patricks Day STEM Challenge Cards

Polishing Coins {pennies}

Polish “gold” for the leprechaun! Dull pennies, white vinegar, salt, bowl, and paper towels.


Sink the Pot St Patricks Day STEM Activity

Sunken treasure! Black pot, a pile of pennies, container of water. Can you sink the pot? How many pennies does it take. Build a LEGO pot!

St Patricks Day Sink Float Science Experiment with Pennies

Leprechaun Computer Coding Game {no computer needed}

Try St Patricks Day STEM with a homemade computer coding game without a computer! Learn some basic coding skills. Large piece of cardboard, poster board or foam board, ruler, markers, craft tape {optional}, obstacle ideas, Leprechaun, pot of gold or skittles. You can check out our superhero coding game for a sample idea. to get an idea of what we will be doing {without LEGO}.

St Patricks Day Leprechaun Ice Melt

Grab your gold and a black mini pot!

St Patricks Day Ice Melting Activity Coin Hunt

St. Patricks Day Science Sensory/Discovery Bottles

You will need a selection of VOSS bottles or other plastic bottles, kitchen ingredients, and a magnetic wand.

Science Discovery Bottles for Kids St patricks Day STEM-2

St Patrick’s Day LEGO 

LEGO bricks. Build rainbows, shamrocks, pots of gold, a Leprechaun Trap or a leprechaun.

LEGO rainbow activity

We hope you have found a few activities to try or try them all! Countdown with us and make sure to have your leprechaun trap ready for the night before St Patricks Day. They are pretty tricky little men though.


Leprechaun’s Gold Coin Catapult: Jumbo popsicle or craft sticks, rubber bands, gold coins, large bottle cap, and heavy-duty glue. If you want to see the basic catapult set up, click here.

Pot-O-Gold Pulley System: Recycle bin items, small black pot, string or rope, pulley mechanism (optional but can be found inexpensively for clotheslines in the hardware store.)

NEW! St Patricks Day Magic Cube Puzzle!


We have taken a bigger interest in physics this year, so we have some fun but very simple St Patricks Day physics activities and experiments to share with you. I haven’t made them into posts yet because I am always wishing for more time! Read more about each one below though.


For this activity you need water, glass jars, food coloring, and kitchen tools (wooden spoon, metal knife or plastic knife). Create an experiment by testing out various materials on the glass jars.

For this set up I added the following amounts of water to the jars: 1/4 cup, 1/2 cup, 3/4 cup, 1 cup, 1 1/2 cups, and 2 cups. Then I added  drop of food coloring to each and stirred.

If you would like to read the sound science that’s going here, click on my original water xylophone post to learn more.

St Patricks Day STEM Activity and Sound Science for Physics with Kids


This activity is a theme variation of our Christmas and Valentines Day balloon rocket activities. It also includes a printable supply list and printable leprechauns and rainbow with a pot of gold.

Explore things that go and launch a leprechaun to his rainbow!


Balloon, Tape, Straws, String, Clothespin (optional), Leprechaun and Rainbow Printout (download and print here), and Scissors


Locate two anchor points across the room from each other. We used two chairs.

Measure and cut a length of string to fit the distance.

Tie off one end of the string.

Thread the straw onto the other end of the string before tying off that end on the 2nd anchor point. Make sure the string is taught between the two points. Though check our experiment notes for more ideas!

Cut out our leprechauns and rainbow or draw your own. You could even use a sharpie to draw one on the side of the balloon.

Blow up the balloon and secure with a clothespin if desired or just hold it.

Tape your paper leprechaun to the balloon and the rainbow to the furthest anchor point.

Tape the balloon to the straw. You can see how we did that in the picture below.


Either release the clothespin or your fingers and watch cupid fly! Note what happens! Once your balloon has reached the other end of the string, slide it back. You may need to readjust or fix tape. Blow the balloon up and try again. Learn other ways to experiment below.


So how exactly does the leprechaun get its go and reach the pot of gold at the end of the rainbow? It’s all about the thrust and Newton’s Third Law of Motion that for every action there is an equal and opposite reaction.

Let’s start with thrust. You blow up the balloon, so now it’s filled with gas. When you release the ballon the air/gas escapes creating a forward pushing motion called thrust! Thrust is created by the energy released from the balloon.

Then, you can bring in Sir Isaac Newton. For every action, there is an equal and opposite reaction. This is the third law of motion. When the gas is forced out of the balloon it pushed back against the air outside the balloon which then pushes the balloon forward!

Kids will love testing out this science concept over and over again, and you can easily turn it to an experiment for the older kids by adjusting the variables. You can even add a stopwatch!

Test out different shaped balloons. Change the angle, tightness, or even type of string! Talk about what happens fig your string is droopy or if the string is as thick as the diameter of the straw opening. How do those factors change the movement of the balloon?

St Patricks Day balloon rocket STEM set up




Construction Paper (or colored copy paper)

Hole Puncher or Scissors


Cut out “gold coins” or circles from your construction paper. We had a hole puncher.

Blow up a balloon but not all the way. All you need is for it to be big enough for your kids to hold comfortably and be able to see what’s happening.


First, you need to charge your balloon. My son chose to rub it in his hair. Try to go in one direction.

Next, place the balloon near the pair hearts but don’t put it on the hearts. You will see the “gold coins” jumping or floating up to the balloon. The coins will even tag coins to follow along.


Why are the paper coins jumping up to the balloon all on their own? They aren’t really because they are getting a boost from static electricity!

When you rub the balloon in your hair you gave it a negative charge. The electrons from your hair flowed onto the portion of the ballon that was touching your hair.

Matter is made up of atoms with have both negative (electrons) and positive (nucleus) parts. You transferred some of the negative to the ballon.

The negatively charged balloon is then able to attract the positive parts of the paper coins which cause them to jump to the balloon!





Looking for easy to print activities, and inexpensive problem-based challenges? 

We have you covered…

Click below to get your quick and easy STEM challenges. 

A variety of new activities, which are engaging and not too long!

St Patricks Day STEM Challenge Cards