Tree City Plunge & Sauna nears Boise opening with cautious rollout

Tree City Plunge & Sauna said its Boise facility was in the final stages of construction, with interior details, equipment installation, testing, safety inspections, technology integration and member-experience upgrades still being finished before opening. The company is taking a cautious approach rather than forcing a date to meet demand, a sign of how much work sits behind a modern plunge-and-sauna build.

That slow roll fits the scale of what Tree City says it is building. The company calls itself the first contrast therapy center in Boise, Idaho, and says it is aiming to become the city’s premier destination for cold plunges, infrared sauna, traditional sauna, relaxation and wellness recovery. Once the schedule is finalized, Tree City said it will announce three milestones: a soft launch, a grand opening and a ribbon-cutting ceremony.

The timeline has already moved in stages. Tree City said on June 9 that it planned to officially open July 1, with a soft opening about one week earlier. It later invited founding members and early supporters to an exclusive Soft Opening Week ahead of the public launch. The business was founded by Evan Reely and Nathan Sales and has listed 754 N Benjamin Ln in Boise as its address.

Tree City’s pricing gives a clearer picture of the market it is trying to serve. Its site lists a $49 day pass or guest pass, a $99 membership for three visits per month, a $249 membership for two visits per week and a $279 unlimited membership. That structure puts the business in reach of occasional cold-plunge users while also encouraging repeat recovery sessions from people who want sauna and plunge work built into their routine.

The Boise area is already starting to build a small contrast-therapy scene. Wellhouse, a Garden City social wellness club at 215 E 34th St, offers sauna and cold plunge sessions, community events, memberships and private events. Tree City’s heavier emphasis on tours, team introductions, wellness demonstrations, membership specials, networking opportunities and giveaways for its ribbon-cutting points to the same idea: this is being sold as a community hub as much as a recovery room.

The recovery pitch also has a growing body of support behind it. A 2025 systematic review and meta-analysis found cold-water immersion has become popular among healthy adults and may reduce short-term muscle soreness and damage while improving perceptual recovery, even as performance and inflammation effects remain less clear. A Mayo Clinic Proceedings review has linked regular sauna bathing with possible cardiovascular and other health benefits, while Harvard Health says sauna use may support heart health, circulation and relaxation. A study of far-infrared sauna bathing also suggested it may aid recovery from strength and endurance training.

That is the pressure behind Tree City’s careful buildout. In a category where the water is cold but the business must run hot, the final checks, the equipment installs and the safety reviews are what turn a coming-soon post into a place people can return to week after week.