Five indoor adventures worth your August in Colorado: the Downtown Aquarium in Denver, Slick City Action Park in Denver West and Southlands, Übergrippen Indoor Climbing Crag in Denver and Castle Rock, Boondocks Food & Fun in Northglenn, and Monkey Bizness in Littleton and Parker. All of them have air conditioning. All of them are covered by one GetOut Colorado membership.
August does something particular to Colorado parents. The sun is still doing damage at 5,280 feet, the camp schedule has run dry, school supply lists are showing up in your inbox, and your kids have memorized every playground within ten miles. Then the afternoon storms arrive, usually right when you've finally gotten everyone into shoes.
So you need somewhere to go. Indoors. Preferably without spending eighty dollars to walk through the door.
Some Augusts are kinder than this. If your week looks clear and you want to be outside for it, we've got a separate guide to outdoor activities for kids in Colorado covering Lakeside, the Pueblo Zoo, and a dozen other places that only work when the sky cooperates.
Why August Sends Colorado Families Indoors
UV at altitude hits harder than it does at sea level. Two hours at the park in August can leave your whole family pink and short-tempered by dinner. Then there's the monsoon pattern, which settles over Colorado in late summer and drops rain on the Front Range most afternoons between two and five.
Parents end up typing things like what can I do with my kids in Colorado when it's too hot outside or indoor places for kids near me in Denver, usually around eleven in the morning with two children already orbiting the kitchen. Options exist. They tend to cost more than you budgeted.
A GetOut Colorado membership changes the shape of that morning. One membership covers admission at 82+ venues around the state, so what you're deciding is which place to go rather than whether you can swing it. Here are five that hold up in August.
1. Downtown Aquarium, Denver
Good for: ages 2 through 12, siblings who agree on nothing Plan on: an hour and a half to two hours
Take a nine-year-old and a four-year-old to the same place and you usually get one bored kid. The aquarium solves that. Everything moves, the lighting is low, the temperature stays the same all day, and the route keeps going, which means nobody stalls out.
You walk through a series of ecosystems on your way around. There's a sunken shipwreck section that stops most kids cold. There are freshwater displays, a stingray touch tank, and Sumatran tigers, which catch a lot of first-time visitors off guard when you came in expecting fish. The building runs to roughly 107,000 square feet and holds around 500 species.
Worth knowing: Weekday mornings run much quieter than Saturday afternoons. The full route handles strollers fine. You're at 700 Water Street in the Platte Valley, so food is close by if the sky clears and you want to keep the day going.
Included with GetOut Colorado.
2. Slick City Action Park, Denver West and Southlands
Good for: ages 4 to 14, kids with too much energy Plan on: ninety minutes to two hours
Waterslide speed with no water anywhere. That's the pitch, and it holds up.
Slick City started in Denver in 2021 and has since grown past a hundred locations signed or opened around the country, which suggests families keep coming back. The slides are dry and patented, and riders use mats to get moving. There's real airtime on the bigger ones. Air courts sit alongside the slides for basketball and dodgeball, and smaller kids get a junior slide zone of their own while they work up their nerve.
For August, the appeal is simple math on energy. Your kids will be tired when you leave. Evenings go better.
Worth knowing: You'll need grip socks, and a waiver has to be signed. Handle both before you show up. Sessions run on a schedule, so check times for whichever location you're driving to.
Included with GetOut Colorado, both Colorado locations.
3. Übergrippen Indoor Climbing Crag, Denver and Castle Rock
Good for: ages 5 and up Plan on: about two hours
Plenty of Colorado kids get their first taste of climbing in a gym like this one. Übergrippen's Denver facility holds around 12,000 square feet of wall, with routes that start at absolute beginner and go well past what most adults can do. Younger climbers get their own area, so a nervous seven-year-old isn't sharing mat space with someone working a hard problem.
Your kid tries the sport this state built its reputation on, and you skip the trailhead, the drive, the altitude. The gym has a good reputation for route setting, and the staff know how to talk a first-timer onto a wall. That part matters more than the square footage.
There's a Castle Rock location too, which helps if you live south of the metro.
Worth knowing: Rentals are available, so nobody has to buy shoes to find out whether they like it. Youth teams fill the place in late afternoon. Mornings are calmer.
Included with GetOut Colorado.
4. Boondocks Food & Fun, Northglenn
Good for: groups, wide age ranges, long afternoons Plan on: two to four hours
This is where you go when the kids want different things and nobody feels like negotiating. Boondocks covers roughly eight acres in Northglenn, and the indoor half holds laser tag, a big arcade, bowling, and a flight simulator.
Rain doesn't touch your afternoon here. Your older kid disappears into laser tag. The younger one parks at the arcade. Food is on site, so a meltdown doesn't require relocating anyone.
Worth knowing: Get there earlier in the day if laser tag is the priority, since waits build. Game cards are separate from admission, so bring a little extra.
Included with GetOut Colorado.
5. Monkey Bizness, Littleton and Parker
Good for: ages 1 to 8 Plan on: an hour and a half
Somewhere safe to let a three-year-old run flat out for ninety minutes. That's the whole job, and these places do it well.
Monkey Bizness runs indoor play centers built around inflatables, soft structures, climbing bits, and mazes. Crawlers and toddlers get sectioned off from the six-year-olds moving at speed. The company is headquartered in Centennial and targets the two-to-ten age range, with no arcade machines anywhere in the building, which is deliberate. Reviews keep circling back to the same points: gates that actually secure, floors that stay clean, seating and coffee for the adults, staff who handle small kids well.
Worth knowing: Socks for everyone, adults too. Party bookings shift open-play hours around, so check before you drive over.
Included with GetOut Colorado.
More Indoor Options on Your Colorado Membership
The Colorado membership runs to 82+ venues. A few more that hold up in August:
- U.S. Olympic & Paralympic Museum, Colorado Springs. Kids race a projected sprinter and try the ski simulator.
- Museum of Boulder. Hands-on kids' floor, rotating exhibits.
- Sky Zone Trampoline Park. Jump courts and foam pits.
- Main Event. Highlands Ranch, Thornton, Westminster, Colorado Springs.
- HD Escape Rooms. Good for tweens who've decided play centers are beneath them.
- Colorado Railroad Museum. Trains, indoor exhibits, the roundhouse.
- Molly Brown House Museum. Short guided tours, Denver history.
- Chipper's Lanes. Bowling in Fort Collins, Greeley, Broomfield, and Horsetooth.
- Colorado Rapids. Matches at DICK'S Sporting Goods Park, and there's a full guide to doing a Rapids game with kids if you want the logistics handled.
- Roller City, Ice Lanes, and The Little Gym when you want variety.
Building an August Week Without Overthinking It
You don't need a plan. You need a rhythm.
Front Range days follow a pattern. Clear mornings, clouds stacking up by early afternoon, rain somewhere between two and five. So put your indoor outing in the back half of the day and leave the morning open for the yard or the pool.
Here's a week that works. Monday, the aquarium, since it starts everyone off calm. Wednesday is Slick City, because midweek is when the energy problem gets loud. Friday, Boondocks with a couple of friends along, since it swallows a group better than anywhere else here. Übergrippen and Monkey Bizness fill whichever mornings need filling, depending on how old your kids are.
Group your venues by region. Northglenn and Thornton pair well. Littleton sits close to Highlands Ranch. Boulder deserves its own trip rather than a detour.
Everything gets redeemed through the GetOut app. Browse, pick, show your phone at the counter, walk in. There's a walkthrough of how the membership works if you want to see the whole flow before you buy.
What the Membership Covers
GetOut is an annual membership. It gets you admission at Colorado venues without paying full price each time you show up. One membership covers one person, so a family of four buys four.
The math tends to settle the question. One aquarium trip for four people already costs more than a single membership. Add a trampoline park afternoon and a round of bowling and you're ahead of it before Labor Day. Members regularly say the pass covered itself on the first or second outing.
There's a second benefit that people notice later. When the outing is already paid for, you go. When it isn't, you find a reason to stay home and everyone ends up on a screen.
GetOut now runs in 31 states, which matters more than it sounds like it does. Say August ends with a drive to Phoenix to see your in-laws. The Arizona membership works the same way as yours does, and there's already a guide to indoor activities for kids in Phoenix for exactly this problem in a hotter climate. Texas gets split by metro, so families headed that direction pick up whichever one matches where they're landing: Austin, Dallas–Fort Worth, Houston, or San Antonio. Same app. Different attractions.
Current Colorado pricing and the full venue list live on the GetOut Colorado membership page.
FAQs
What are the best indoor activities for kids in Colorado in August? Downtown Aquarium in Denver, Slick City Action Park, Übergrippen Indoor Climbing Crag, Boondocks Food & Fun in Northglenn, and Monkey Bizness in Littleton and Parker. Every one is climate-controlled and covered by a GetOut Colorado membership.
What can I do with kids in Denver when it's raining? Entertainment centers, the aquarium, climbing gyms, museums. Boondocks and Main Event suit groups well because several activities sit under one roof.
Are there indoor waterpark-style activities in Colorado? Slick City Action Park comes closest. Dry slides, mats instead of water, and the same speed you'd get at a waterpark.
What's the cheapest way to do indoor activities with kids in Colorado all summer? An annual membership like GetOut usually costs less than a handful of individual admissions and covers 82+ venues around the state for the year.
Is a GetOut membership worth it for a family? For families who get out more than once or twice, the numbers work. Most members report covering the cost within their first couple of visits.
Do I need reservations? Depends on the venue. Slick City runs timed sessions. Übergrippen gets busy when youth teams are in. The app shows availability and flags what needs booking ahead.
Does a GetOut membership work outside Colorado? Each membership is tied to its market, so a Colorado pass covers Colorado venues. Traveling families often add a second one for wherever they're going. Arizona is a common pairing for Front Range families, and Texas runs four separate memberships by metro.
There are a few weeks of August left. The storms will keep arriving on schedule and your kids will keep asking what the plan is. Pick one, open the app, go.
Explore the GetOut Colorado membership →