Planet Fitness

4.2
758 reviews
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Business Details

880 E 104th Ave, Thornton, CO
80233, United States
(303) 452-4426
https://www.planetfitness.com/gyms/thornton-co
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About

Fitness CenterTanning SalonSpaGymPersonal Trainer
At Planet Fitness, we believe We’re All Strong On This Planet™. No two members are the same – their goals, routines, and reasons for working out are different – but the one thing they all have in common is their strength. With 2,700+ locations and best-in-class equipment, we provide a welcoming space for everyone to build strength at their own pace in a Judgement Free Zone®. Find yourself at a club near you or download our mobile app for hundreds of ways to get strong.

Location

Planet Fitness
880 E 104th Ave, Thornton, CO
80233, United States

Hours

Reviews

4.2
758 reviews
5 stars
497
4 stars
104
3 stars
39
2 stars
33
1 star
85

What are people saying?

AI-generated from recent customer reviews

Staff Friendliness

Customers consistently praised the staff for being friendly, welcoming, and helpful.

Cleanliness

While many reviews highlighted cleanliness, some customers reported issues with dirty showers and locker rooms.

Equipment Availability

Several customers appreciated the availability of equipment, although some noted that certain machines were frequently out of order.

Atmosphere

The gym was described as having a positive, non-judgmental atmosphere, making it comfortable for members.

Customer Service Issues

Some customers expressed dissatisfaction with customer service, particularly regarding handling complaints and membership issues.
  • MD
    Melbel Danielle
    Oct 24, 2025
    5.0
    First of all thank you to the franchise owner for all the new equipment. It sets you apart from majority of other locations. I am constantly at diff Pfs because of my schedules from denver, brighton, westminster, thorton, lakewood, longmont and more. I was so happy to see a actual free weight rack in a PF. Also all the other numerous new machines everywhere, man I was like a kid in the candy store! I hope all other locations follow suit, thanku! I only wish hours were extended on weekends like weekdays :)
  • TR
    The legit M.J.R melanie Rodriguez
    Oct 7, 2025
    1.0
    Is the worse experience I have I get stolen from my locker they take my car keys today and they don’t have cameras outside and the front desk they just told me you should not live your keys in the locker plus they don’t have hat water
  • GB
    Gs Bhullar
    Sep 30, 2025
    5.0
    Nice staff
  • RM
    Raymond Morris
    Sep 17, 2025
    4.0
    There always just the right amount of people there so it's not to crowded. Very much enjoy working out there.
  • TM
    Topher Michael
    Sep 15, 2025
    2.0
    Smelliest gym I've ever been to and has never gotten any better. Less crowded than Thornton/Larkridge. Bathroom soap is empty majority of the time. Lots of equipment out of order.
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Frequently Asked Questions About Planet Fitness

What are the regular operating hours of Planet Fitness in Thornton, CO?

Planet Fitness Thornton is open Monday from 5:00 AM to midnight, Tuesday to Thursday 24 hours, Friday until 9:00 PM, and Saturday and Sunday from 6:00 AM to 8:00 PM.

Are there any special holiday hours I should be aware of at Planet Fitness Thornton?

Yes, holiday hours vary; for example, on November 27, 2025, it's open from midnight to noon, and on January 1, 2026, it's open from 6:00 AM to 11:59 PM. Check their website for full holiday hours.