The Backyard Olympics (Kids Budget Edition)
Kids party ideas on a budget: backyard relay events, handmade medals and an opening ceremony with adult supervision.
Outdoors · Pocket budget
The Cardboard Castle Siege
Kids build cardboard forts and play a supervised, soft-ball siege on a budget.
PLAN
READY 6–12 people High-energy
READY 6–12 people High-energy
Best for6–12 people
BudgetPocket budgetEstimate: $15+
LocationOutdoors
EnergyHigh-energy
01
Why it works
Why The Cardboard Castle Siege works
The party has two halves that match how kids burn energy: a focused building stretch where teams plan, tape and argue over turret placement, then a short, loud burst of throwing. The forts give the siege stakes, because nobody wants their wall to fall, and the siege gives the building a purpose.
Throwing soft balls at targets on the forts, not at each other, keeps it fair for younger and shyer kids. A seven-year-old can topple a paper-cup tower as well as a ten-year-old can. Boxes are free, so the budget goes to cake.
It suits six to twelve kids, roughly ages five to ten, in a yard with a few adults helping.
02
Before you begin
Gather your supplies
Tick these off as you shop, borrow or pull them from the house. The list is a practical starting point, not a claim that every item is required.
03
The plan
How to run it
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Divide and Build
The day before, an adult pre-cuts doors and windows with a box cutter and pulls out any staples. At the party, teams get 30 minutes to assemble and reinforce low, stable forts with tape, away from roads, pools and other hazards, with an adult directly supervising each team.
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Decorate
Kids add a crest and banner with non-toxic markers and trim paper with child-safe scissors; the box cutter stays with the adults. Keep walls below the shortest builder's shoulders, and do not create narrow hiding places, use pointed flagpoles or let children climb on the structures.
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Play the Siege
Set a rope boundary and use only soft paper or foam balls. Players throw from behind marked lines at a paper-cup tower on the other team's fort, never at each other, and play pauses between rounds to collect the balls.
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Clear and Refuel
Flatten the boxes for recycling, sweep for loose tape and litter, and collect every ball. Serve water and labeled food at a separate table away from the forts.
04
Keep the room moving
Run of show (2–2½ hours)
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2–3 weeks before
Collect boxes
Ask neighbors and local shops for large boxes and store them flat and dry. Aim for three or four big boxes per team, and ask parents about food allergies on the invite.
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Day before
Pre-cut and prep
An adult cuts doors and windows with a box cutter and pulls out staples. Make about 20 paper balls per team from crumpled newspaper wrapped in masking tape.
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30 min before
Mark the field
Lay out two build zones well apart with rope boundaries and taped throwing lines. Set out tape, markers, water, sunscreen and the first-aid kit, and assign each adult a zone.
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0:00 Kids arrive
Shields and teams
Early arrivals decorate paper-plate shields. Form teams by drawing colored cards from a bag, never by captains picking.
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0:20
Build for 30 minutes
Adults circulate, keep walls lower than the shortest builder's shoulders and stop any climbing. Call time at 10 minutes and 2 minutes left.
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0:50
Snack break
Serve water and labeled snacks at the food table away from the forts while adults stack a paper-cup tower on each wall.
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1:10
Siege rounds
Play three five-minute rounds from behind the throwing lines; the team that topples the other tower wins. Pause play to collect balls between rounds.
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1:40
Teardown and cake
Turn flattening boxes for recycling into a race, sweep for loose tape, then gather for cake and goodbyes.
05
Make it yours
Variations
Rainy day
Move to a garage or cleared living room, build smaller tabletop-height forts and use only foam balls. Put away breakables and anything on low shelves.
For ages 3 to 5
Skip team play. Parents help build one shared castle, and kids take turns knocking a cup tower off a box from a short line.
For a small group
With four or five kids, build one big fort together and lay siege to a painted cardboard dragon target instead of another team.
For older kids
Add an engineering challenge: whichever wall is still standing after three rounds wins a bonus. Spoon catapults launching pom-poms work well.
06
Food and drink
What to serve
Serve finger food at a separate table: sandwiches cut into brick-shaped rectangles, cheese cubes, fruit cups, veggie sticks and cupcakes or a castle cake, roughly two small sandwiches per child. Skip toothpicks and whole grapes for little ones, and choose nut-free snacks unless every family confirms otherwise. Offer water and juice boxes, plus iced tea or coffee for adults.
07
If it goes sideways
Troubleshooting
- Forts collapse before the siege.
- Tape seams on the inside, add triangle braces in corners and stand a full water jug inside the base.
- Kids start throwing at each other.
- Blow the whistle, pause, restate the rule and restart. An adult referee on each side catches it early.
- Wind keeps moving the boxes.
- Weigh bases down, shift to the sheltered side of the house or move to the garage.
08
Questions
Frequently asked questions
What age is a cardboard fort party good for?
Ages five to ten get the most from it: old enough to tape and plan, young enough to love a castle. Younger kids enjoy a parent-built fort with simple target throwing, and older kids like engineering challenges.
How many boxes do you need for a cardboard fort party?
Plan three or four large boxes per team of four to six kids, plus a few smaller ones for towers. Appliance and moving boxes are best. Collect early, because good boxes go fast.
How do you make safe throwing balls for kids?
Crumple a sheet or two of newspaper into a ball and wrap it with masking tape so it holds its shape but stays soft. Foam balls also work. Avoid anything hard, wet or heavy, and keep the rule of aiming at targets, not people.
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