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If your kids love climbing, jumping, swinging, or pretending they’re on American Ninja Warrior, there’s a spot in Oak Creek that might become their new favorite place to play. Ultimate Ninjas Oak Creek offers a huge indoor obstacle gym designed for kids, teens, and adults—whether they’re brand-new to ninja training or already climbing anything they can reach.
This guide walks you through everything families need to know: classes, open play, birthday parties, camps, and what the space is actually like inside.
💡If you’re looking for more places like this around the area, you can explore our full roundup of Ninja Gyms for Kids in Milwaukee.
Quick Facts
- Location: 400 W Bell Ct #350, Oak Creek, WI
- Ages: Toddlers through adults
- Programs: Classes, open play, camps, birthday parties, elite training team
- Standout features: Mega curved wall (18.5 ft), rings, trampolines, agility course, Lil’ Ninjas area
- Parking: Free lot
What You’ll Find Inside the Gym
Ultimate Ninjas is a 16,000-square-foot obstacle course gym designed by real American Ninja Warrior athletes. It’s clean, bright, and built for both play and skill-building.
Lil’ Ninjas Area (Ages 3–5)
A 4,000-square-foot space built just for little ones—with smaller versions of the big obstacles so toddlers and preschoolers can join in safely.
Parents in reviews love that it’s:
- gated
- soft-padded
- closely supervised
- physically helpful for developing balance and coordination
Great for kids who love to climb but need something scaled to their size.
For Big Kids, Tweens & Teens
The main gym includes:
- The 18.5-foot Mega Wall
- Double Salmon Ladder
- Ring Slider
- Cargo nets
- Monkey bars
- Trampolines
- Hanging grips
- Agility course
- A large turf area
Kids can explore during open play, take structured classes, or challenge themselves with coached skill progressions.
For Adults
Parents are welcome to participate, too. There are obstacles and training rigs sized for adults, plus opportunities for structured fitness classes.
Classes at Ultimate Ninjas Oak Creek
Classes are offered for a wide range of ages and abilities, and they’re one of the best ways to introduce kids to ninja training.
Kids Classes
Perfect for ages 6+. Students learn how to:
- climb obstacles
- build grip strength
- balance
- problem-solve
- develop confidence
Coaches are trained ninjas themselves (many have been on American Ninja Warrior).
Lil’ Ninjas Classes (Ages 3–5)
A gentle introduction to:
- climbing
- jumping
- coordination
- strength building
Parents say staff members are exceptional with young children.
Elite Team
For kids and teens who want to train at a competitive level.
Great for families whose kids are inspired by:
- American Ninja Warrior Junior
- obstacle competitions
- agility sports
Trial Class
Ask about a free trial class, which is a nice option if families want to see if the program is a good fit.
Open Play
Open play is one of the most popular options for families who want something fun, active, and flexible.
Kids can:
- try a variety of obstacles
- move at their own pace
- burn off energy in a supervised setting
Ages:
Toddlers through teens (adult supervision required).
What to Wear:
- athletic clothes
- clean, closed-toe tennis shoes
- hair tied back
- no loose jewelry
What Parents Say About Open Play:
Recent reviews highlight:
- friendly staff
- patient coaches
- good mix of structured help + free play
- great experience for kids with sensory or muscle-tone needs
- excellent for birthday party groups
Birthday Parties
Birthday parties are a huge part of the experience at Ultimate Ninjas, and reviewers consistently mention:
- high-energy staff
- clear instructions
- patience with all age and skill levels
- private or semi-private space
- smooth flow between different parts of the gym
Why parents like it:
- Kids are constantly moving
- Staff guides them through obstacles
- Both big kids and little kids can participate
- Great for groups
- Clean, organized, and easy for parents
Party Tip:
Mention that package lengths vary (Lil’ Ninjas parties are shorter). You can direct readers to their website for current options.
Camps at Ultimate Ninjas
The gym offers camps throughout the year, including:
- Summer Camps
- Spring Break Camps
- Winter Break Camps
- School Day Off Camps
Parents note that camps include:
- obstacle training
- games
- free play
- hide and seek
- team activities
- lots of movement
Special Features
- Mega Wall (18.5 ft) — rare for indoor gyms
- Basketball area
- Obstacle setups built by professional ninjas
- Separate area for younger kids
- Nationally recognized coaching team
Tips for First-Time Visitors
- Sign the online waiver before arriving.
- Wear athletic shoes (no Crocs or sandals).
- Bring a water bottle.
- Arrive a few minutes early for classes.
- If you’re coming for open play, check the schedule—it changes seasonally.
FAQs
What age is best to start ninja training?
Kids as young as 3–5 can start in the Lil’ Ninjas program. Older kids can join structured classes or open play.
Do they offer birthday parties?
Yes. Parties are one of the most popular offerings at Ultimate Ninjas, with staff guiding kids through obstacles and handling transitions.
What should kids wear?
Athletic clothes and clean sneakers. Hair tied back. No jewelry.
Is this a good option for beginners?
Absolutely. Obstacles are scaled for various ages, and staff is trained to help all skill levels.
Do they offer competitive ninja training?
Yes. The Elite Team program is available for kids who want to train at a competitive level.
Can adults participate?
Yes. Adults can use the facility during classes or open play times.
Location & Contact Information
Ultimate Ninjas Oak Creek
400 W Bell Ct #350
Oak Creek, WI 53154
Phone: (414) 307-4411
Website: ultimateninjas.com/location/oak-creek
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Calie Herbst, Editor-in-Chief of Milwaukee With Kids, has spent over a decade combining her experiences as a parent of three to create a hub for Milwaukee’s family adventures.
Her decade-long teaching career in Milwaukee Public Schools and academic background, including a Master’s in Teaching from Marquette University and dual B.A.s in Sociology and Spanish from the University of Wisconsin – Madison, fuel her passion for inclusive and engaging family content.
Calie is also a recognized voice in local media, contributing to WISN Channel 12 News, WTMJ Wisconsin Morning News, Fox 6’s Real Milwaukee, and B93.3.
Discover more about Calie’s journey and editorial approach on her About Page and Editorial Policy Page.
