Mountainside Fitness Peoria
9745 W Happy Valley Rd, Peoria, AZ
Mountainside Fitness Peoria sits in the Mountainside Crossing center at 99th Avenue and Happy Valley Road, a club the chain built out around 2020 with a sauna and steam rooms from the start and has since renovated. Members talk about the 'new big sauna' and updated steam room, and the club has joined Mountainside's recovery push with cold plunge tubs (kept at 48-62°F across the chain) and red-light therapy, which are sold together as a Wellness add-on from $20 a month on top of the base membership. The rest is the standard Mountainside package: a big free-weight floor, 80-plus group classes a week, a Serenity yoga studio, basketball courts, recovery massage chairs, an MCafé smoothie bar and childcare. Memberships run month-to-month from about $48.85 with no enrollment fee; a non-member can request the chain's free 5-day pass online, though one listing says the pass should be used with a member, so confirm before driving over. Towels are free and the locker rooms are full service. Hours are 4:30 a.m. to 11 p.m. Monday to Thursday, 4:30 a.m. to 9 p.m. Friday and 6 a.m. to 9 p.m. on weekends. It is a gym first, so expect a quick sauna-and-plunge contrast after training rather than a lounge-and-tea bathhouse evening; for the north-west valley at this price it is hard to beat.
Quick facts
- Type
- Gym/Fitness Recovery
- Heat
- Traditional sauna, Steam room
- Cold
- Cold plunge tub
- Temperatures
- Cold plunge 48–62°F
- Membership
- $49/mo unlimited
- Booking
- Walk-in + Reservation
- Session style
- Open access
- Gender
- Co-ed with separate areas
- Clothing
- Clothing required
Hours
- Monday: 04:30–23:00
- Tuesday: 04:30–23:00
- Wednesday: 04:30–23:00
- Thursday: 04:30–23:00
- Friday: 04:30–21:00
- Saturday: 06:00–21:00
- Sunday: 06:00–21:00
Last updated November 2026.