How To Make A Leprechaun Trap (Fun STEM activity!)

You don't need to know how to make a leprechaun trap to guide your littles through this super-fun STEM activity for preschoolers!

How do you make a leprechaun trap? Ask your kids!

Having your kindergartener or preschooler make a leprechaun trap is one of the most educational March crafts for kids I’ve ever found, as well as one of the most fun St. Patrick’s Day activities for kids. But just how do you make a leprechaun trap?

Leprechaun traps for kids are easier than you might think. The best part is, as the parent or teacher, YOU don’t even need to know how to make a leprechaun trap! That’s one of the best parts of building leprechaun traps for kids: give your littles a few supplies, and from there it’s an entirely kid-driven activity!

Whether you’re looking for easy St. Patrick’s Day crafts for kids, or you’re a homeschooling parent in search of a preschool engineering activity or STEM activities for kindergarten, building leprechaun traps is one of the most fun STEM activities for 3-7 year olds (science, technology, engineering, and math) that my kids have ever done. 

If your kids are stuck, no worries – these leprechaun trap ideas for kindergarteners will get them started. With these easy leprechaun trap ideas, your leprechaun trap for kindergarten project (or March crafts for preschoolers) is sure to be a hit. 

Why preschool and kindergarten leprechaun traps?

With just a few supplies and minimal guidance, even 3- and 4-year-olds can figure out how to build a leprechaun trap. But you don’t need to search far and wide for easy leprechaun traps ideas. Give them a few materials (or, if they’re a little older, let them scavenge some from around the house), and they’ll come up with their own ideas for leprechaun traps in no time!

How to Make a Leprechaun Trap: Easy STEM Activity for Preschoolers*

*and kindergarteners, first graders, second graders…

Why building a leprechaun trap is one of THE BEST kindergarten or preschool engineering activities:

This is the basic idea behind this activity:

  • Give your kid a cardboard box or similar container plus a few other crafting/household supplies.
  • Tell your child that they need to figure out how to trap a leprechaun, and that leprechauns are tiny creatures who, if you can catch one, will (according to legend) give you their gold. (See the book suggestions below for more inspiration.)
  • Have them create a trap that will in theory accomplish this.
  • (Most important step) Have them explain to you – and then either write down, or have THEM write down – HOW exactly their trap is supposed to catch leprechauns.

That final step is CRITICAL from a learning perspective.

It’s one thing to mess around with ideas. But having to explain how something works to someone ELSE kicks up the challenge level by several notches.

And let’s face it, if you’ve scrolled through instructions online from other grownups on how to make leprechaun traps, the results (at least those I’ve seen) are long on grownup prettiness, and short on actual kid ingenuity.

As Essie put it when I asked her what was most important about building a leprechaun trap, in preparation for writing this post:

“Be creative. You don’t have to make it look amazing; just have fun!”

Be creative. You don't have to make it look amazing; just have fun!Click To Tweet

My kids first did this engineering activity in their final year of preschool. They loved it so much, they insisted on building their own leprechaun traps at home for several years afterward. Each year they would come up with a new, different, yet equally creative way to “trap” a leprechaun. I have loved watching their problem-solving skills evolve, along with their ideas about design and functionality.

So if you’re ready to turn your kids loose on this super-fun learning activity, here is 

How To Build A Leprechaun Trap

What you’ll need to make a leprechaun trap:

The only must-have is some type of box or container. A shoebox works great for this, and is what my girls always used in preschool. But really, any box will do.

In addition to your box/container, you’ll want to gather (or let your child gather) other items from at least one of these categories (or more, if you prefer):

Building a leprechaun trap:

If you’re not of Irish ancestry (she raises her hand), reading one of these books with your littles will help them get into the spirit of the challenge:

Once you’ve gathered your supplies and read your inspirational story/stories together, let them loose on the materials and see what they come up with!

If sensory tables are already part of your life at home (whether for fun or as part of your homeschooling routine), you may already have your March one set up with all the inspiration your kiddos could need. That’s how the teachers at our girls’ preschool did their March table every year, though they always added the berry baskets and straws on trap-building day.

Essie and a classmate choosing supplies for their preschool leprechaun traps

From there, your child’s trap can be as simple or as complicated as they like. Kimmie’s first leprechaun trap was actually an elaborate double trap, designed to hold two leprechauns.

Debriefing you engineers on how their traps are supposed to work:


  • Knowing upfront that they’ll need to explain how their trap works to others is an important part of helping your little engineers think through their design choices.
  • Moreover, having them present this information to others, by either dictating or writing down/reading to others, is a great way to give them confidence in speaking to others in a classroom setting – a critical skill to practice for higher grades, and life beyond school.

Leprechaun trap design sample A: Kimmie’s first leprechaun trap

Unfortunately, I can’t lay my hands on a photograph of the description Kimmie dictated after creating her first-ever leprechaun trap. But the rationale behind her double-leprechaun design went something like this: The traps themselves (the green plastic berry baskets) had pots-of-gold erasers, rainbow erasers, and shamrock confetti inside to attract the leprechauns in through the pink straws, which were one-way entry points. Once they entered through the pink straws, the leprechauns couldn’t escape back through them to the outside world.

The green straws were supposed to be two-way connectors joining the two traps, so that the leprechauns could get back and forth between them. This was critical, because only ONE of the traps had a toilet, so of course both trapped leprechauns had to be able to “go potty,” should the need arise.

I think the yellow spool in the picture was the toilet. I also think younger sister Essie must have been working hard on toilet-training at the time, since I remember Kimmie being adamant about the importance of this aspect of her design.

Leprechaun trap design sample B: Essie’s first leprechaun trap

When it was Essie’s turn to build her first trap in pre-K, I was surprised that she was done in under five minutes, with a “trap” so bare-bones, I kept thinking she must just be getting started. But no, she insisted her trap was complete.

Her classmates were busy applying elaborate decorative schemes to the outsides of their traps:

In contrast, this was Essie’s streamlined leprechaun trap design:

And this, in her own words, is how it was supposed to work:

“A leprechaun will see the flag and want to jump in and get stuck.”

More specifically, the leprechaun would land inside the pom-poms supporting the flag within the green hat, and be mired there/unable to get free of their soft cushiony-ness. (Not that the leprechaun would want to, as the pom-poms would make such a comfy landing place.)

Leprechaun trap idea C: Slip-n-slide

While this is definitely a fun STEM challenge for preschoolers, it can also work well with kindergarteners and early elementary school students. My girls were so taken with this idea, they insisted on trying to “trap” leprechauns at home for several years after this preschool engineering challenge.

(OK, let’s be honest: Kids measure the season by candy acquired. First there’s Halloween, then candy canes and gelt in December, then Valentine’s Day candy treats, and eventually the Easter Bunny comes. Apparently, the final lesson my girls learned about trapping leprechauns in preschool is that they spring your traps and create a huge mess. But they ALSO leave candy behind, as a consolation prize for your not getting their gold. So my kids keep trying to trap a leprechaun not because they want the gold, but because they want more candy. And I keep humoring them.)

Both the creation and the materials collection was on them – I had nothing to do with these efforts, except for occasionally supplementing their supplies on request.

Their first at-home design was super-simple, and used a round box from Kimmie’s room. They lined the box with plastic bags, and put a rolled-up pair of slipper socks in the bottom:

That string of shamrocks you see was actually a light-up necklace that someone gave them. The flashing lights were there to grab the leprechaun’s attention and inspire a closer look. Once he leapt high enough to scale the sides of the box, the plastic bags were supposed to create a slippery surface that would prevent his crawling/jumping back out.

Meanwhile, the ball of socks served as a pillow for when he got tired and wanted to take a nap. My girls are clearly big on creature comforts!

Sample leprechaun trap idea D: Lap of luxury

The next time, the girls decided to take things up a few notches. They filled their cardboard box with all sorts of goodies they collected from their bedrooms: a small mirror rimmed with green “gemstones” to grab the leprechaun’s attention, a green cup-plate resting on its storage box to serve as a plate and table, a clamshell for a lounge chair, and even a comfy bed between the table and lounger. The chair pulled up to the green plate/table was the hat from Essie’s preschool trap the previous year, as was the box (!). 

It’s an interesting coincidence that in our household, St. Patrick’s Day always falls around the same time as Girl Scout Cookie sales season. Apparently, this particular year, the girls decided to apply their newfound marketing know-how from all those cookie trainings to their leprechaun-trapping efforts, by putting up this sign a few feet away from their comfortable “trap”:

I mean, if you were a leprechaun and you saw a sign bigger than you that said “nice house” with a huge arrow pointing that-a-way, surely you’d go check it out, right?

Building a Leprechaun Trap Idea E: Leprechaun Tower

By the time the following year came around, the girls had earned even more marketing badges during yet another Girl Scout Cookie season, so had even more marketing expertise to display. They fished a box out of the recycling bin and asked if they could raid a jar I keep with scraps of ribbon, yarn, and the like.

And then they put their new gel pens and their marketing expertise to work. This is what they came up with:


This design was supposed to work like a lobster trap. The net over the opening was, again, a one-way passage: drawn in by the slick advertising above the door and the colorful string inside, the leprechauns would pass through the hole in the yellow mesh and enter the “building.” But once inside, they’d be stuck there.

At least they’d be able to play and snooze in the soft, comfortable yarn, which I think the girls saw as a cross between bedding and jungle-gym material.

Postscript: What to do after your kids build their leprechaun traps

In preschool, the kids always “set” their traps out the night before St. Patrick’s Day in the classroom, only to discover the next day that the leprechauns had visited – but resisted being caught. You could tell they’d been there because the classroom was a topsy-turvy mess: supplies in the wrong place, things turned upside down or knocked over, etc.

Also – the kids’ favorite – the leprechauns always “peed” in the toilet. (And then forgot to flush.) And also left little green footprints all over things like the tabletops and other (easily washable) surfaces.

Is it leprechaun pee, or just green food coloring in the toilet? Only the leprechauns (and the grownups) know for sure!

And then the teachers would always have the kids take off their shoes before padding down the hall to the indoor gymnasium or some such. When they’d pad back to the classroom a half-hour later, those crazy leprechauns would have left (individually-wrapped) candy in the kids’ shoes!

True confession: I don’t keep wads of candy lying around the house. And my kiddos’ desire to trap leprechauns on any given year often emerges at the last possible minute on March 16th. So it’s not like Halloween or Easter, when one’s had time to shop accordingly.

Moreover, “trashing” a preschool classroom (and then having sixteen little helpers assist in setting things right again, within ONE room) is one thing. Having my entire house trashed before the kids go to school, and having them take off before there’s time to do much cleaning up, not so much.

So this is how we’ve “tested” leprechaun traps at home instead:

  • I have the girls set out their traps in the front hall, presuming that the leprechauns would enter through the front door.
  • I then end up scrambling around the house, after they’ve gone to bed, to see what candy I can find. (Usually it’s either Jelly Bellies from some personal stash I’ve been working on, chocolate chips and mini marshmallows from their hot chocolate supplies, or some jelly beans I’ve already acquired for Easter baskets. In any case, the candies aren’t individually wrapped, and I’m not about to dump unwrapped candy into my kiddos’ stinky shoes. Hence the candy goes in and around the trap instead.)
  • Next I try to “mess up” the traps as best I can, and/or otherwise leave some (small, contained) mess suggesting leprechauns might have been there. (The rainbow confetti from my hole punch was my favorite.)
Those messy leprechauns! At least they don’t trash my ENTIRE house when they visit!
  • And then, when I get up on St. Patrick’s Day, it’s time to tint the water in the first-floor toilet and in the girls’ bathroom upstairs. And dab some green food coloring – er, leprechaun footprints – around the countertops in both bathrooms as well. (IMPORTANT: Use a disposable vinyl/latex glove for this dabbing! Otherwise, you’ll have telltale green food coloring all over your hands. I’ve made this mistake more than once. Also, be sure to trash the glove where your kids won’t come across it.)
  • Finally, tell your kids next morning, when they conclude that “the leprechauns must have come,” that you’ve already tidied the rest of the house, but you’ve left them the special jobs of cleaning up the leprechauns’ mess in (for us) the front hall and the two bathrooms the leprechauns visited. (One bathroom per child.) Works like a charm.

And the joy of their new candy stash far outweighs having to clean up after the leprechauns.

Divvying up their loot

A final warning: While I am not Irish, my husband’s family has a non-trivial amount of Irish ancestry. So my kids can get away with celebrating St. Patrick’s Day on that account. Ditto for setting leprechaun traps at home.

But they’d always get odd looks from the other kids at the bus stop (most of whom had attended the same preschool as my girls, so knew all about leprechaun traps) when my girls would try to compare notes on St. Paddy’s hauls, and the other kids would generally respond, “We don’t set leprechaun traps in our house…”

Whether your kids can claim Irish ancestry or not, you might want to caution them that not everyone knows the “secret” of trapping leprechauns (and getting candy in return), or celebrates this tradition at home. Thus it might be advantageous NOT to share this secret with their peers.

Have your kids made leprechaun traps before?

If so, let us know how it went – and what happened when the leprechauns “visited” your house/their classroom and avoided capture – in the comments!

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18 thoughts on “How To Make A Leprechaun Trap (Fun STEM activity!)”

  1. This is fun and very timely. I think my kids will have a blast doing this. I think it’s also applicable during Christmas time to catch the elves. (which sounds cruel but my daughter keeps asking if they’re real. Anyway, thank you for sharing this. Will definitely do this in time for St. Patrick.

  2. I know I would have not minded setting up these traps when the kids were younger if I had thought of it (never mind the zero Irish ancestry as we are from India:-)) But I recall the kids’ elementary school teachers would really create a wonderful scene straight out of St.Paddy’s land in the classrooms for the kids.. always worth the look on their faces

    1. LOL right back at ya (me at least) on non-Irish! But you’re right – it’s a great activity regardless of background, because of the fun learning component that goes with the engineering challenge of it 🙂

    1. It definitely is! The girls and I are putting together a “trap-making-kit” for my nieces right now, now that the eldest is the right age for this :)…

    1. Aww, how fun! My daughters and I were thinking we should send supplies to their younger cousins in a few weeks so they can do it this year, too!…

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