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Mountain Strong Thornton Gym

4.9 ★★★★★ 98 Google reviews · Climbing gym in Thornton, Colorado

Gym offering activity-focused fitness classes for CrossFitters, climbers, skiers & more.

Plan your visit

  • Gear rental nearly every climbing gym rents shoes (~$5–8 typical) and chalk; harness rental is often bundled with a ropes pass
  • Waiver always required at climbing gyms — sign it online before you go to skip the front-desk line
  • First timer? bouldering needs zero experience — rent shoes and walk in; staff will point you at the easiest problems
  • Today see hours ·
  • Phone (720) 460-1778
  • Website mountainstrongdenver.com

Hours

Monday 6 AM–8:15 PM
Tuesday 6 AM–8:15 PM
Wednesday 6 AM–8:15 PM
Thursday 6 AM–8:15 PM
Friday 6 AM–8:15 PM
Saturday 10 AM–1 PM
Sunday Closed

Hours can shift for holidays, competitions, and youth-team practice — worth a quick check before a special trip.

What climbers say again and again

The things reviewers bring up again and again across 98 Google reviews — with their own words as proof.

🤝 welcoming community 13 mentions

“I have been going to Mountain Strong since December and have enjoyed the challenge of the classes and the feeling of community that the gym offers.”

From the reviews

Best gym I’ve ever joined. The coaches and community make the difference. From a coaching perspective, technique and safety come before performance. The coaches care more that you don’t get hurt than any other nonsense. The community, while friendly, pushes you to do your best.

★★★★★ — Derek, Mar 2021

The community that Mountain Strong has been able to cultivate is wonderful. With many conditioning gyms, it sometimes can feel intimidating but not here. The coaches and owners make you feel part of their family. The members are open, friendly, and the best part, encouraging.

★★★★★ — Nocole, Nov 2021

Prior to joining Mountain Strong, I had been going to a traditional gym for fitness and a typical climbing gym for climbing. Both gyms were passable. However, my fitness levels and climbing grades had plateaued. Then, I found Mountain Strong.

★★★★★ — Jake, Aug 2017

I have been going to Mountain Strong since December and have enjoyed the challenge of the classes and the feeling of community that the gym offers. I really appreciate the knowledge and professionalism of the staff, and although I am newer to lifting, they have been patient and provided excellent feedback.

★★★★★ — Katharine, Feb 2021

Excerpts from public Google reviews. Read all 98 reviews →

Where to find Mountain Strong Thornton Gym

9499 Washington St c, Thornton, CO80229

Get directions

Climbing gyms near Mountain Strong Thornton Gym

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Listing verified July 2026 from public business records and climber reviews. Something out of date? Report a correction. Own this gym? Claim your listing — it's free.