PORTAL° Thermaculture
Bathhouse in Boulder, CO. About 30 miles from Denver.
Every sauna and bathhouse in and around Denver
- Type
- Bathhouse & contrast therapy
- Address
- 4949 Broadway #113, Boulder, CO 80304
- Phone
- (303) 594-0085
- Website
- portalthermaculture.com
- Rating
- 4.9 out of 5 on Google from 14 ratings, as of November 2, 2026
What it offers
- Cold plunge (on the venue's own website)
- Memberships (on the venue's own website)
Only features we found stated by the venue or its listing, website checked November 2, 2026. Missing from this list does not mean missing from the venue.
What a bathhouse is
A wellness bathhouse or contrast-therapy club pairs hot rooms (sauna, steam) with cold plunges and often warm pools, in a designed space you book by the session or by membership. Some run guided sessions; most are co-ed with swimsuits.
- Finnish sauna160 to 200°F, air, low humidity160 to 200°F, air, low humidity
- Cold plunge39 to 59°F, water39 to 59°F, water
What to bring
- A swimsuit (most are co-ed)
- Flip-flops
- A water bottle
- Your booking confirmation
Etiquette
- Shower before the pools.
- Keep the cold plunge short at first and get out if you feel unwell.
- Respect quiet zones and phone rules.
- Rest between hot and cold rounds.
General guidance for this kind of venue, not this venue's own rules. Read more: sauna etiquette by type, sauna safety.
Nearby alternatives
Ever Sky
Bathhouse & contrast therapy
4730 Broadway, Boulder
Cold plunge, Day pass or drop-in, Women-only areas or sessions
under a mile away in Boulder
4.6 on Google (21)- 4.9 on Google (19)
Ember & Ice
Bathhouse & contrast therapy
1718 Broadway, Boulder
Cold plunge, Day pass or drop-in
3 miles away in Boulder
5.0 on Google (296)Third Space & Co.
Bathhouse & contrast therapy
2480 49th St e, Boulder
Cold plunge, Day pass or drop-in
4 miles away in Boulder
4.8 on Google (52)Puffin Sauna Club
Bathhouse & contrast therapy
9417 N Foothills Hwy, Longmont
Cold plunge, Day pass or drop-in
6 miles away in Longmont
5.0 on Google (30)Isolate Float Center
Bathhouse & contrast therapy
643 S Broadway, Boulder
Cold plunge, Private rooms
6 miles away in Boulder
4.7 on Google (193)
Where this comes from
Source: the venue's Google Maps listing (category "Wellness program"), checked November 2, 2026, and the venue's own website. We list it as a bathhouse because of its own website describes a hot and cold circuit with a sauna and cold plunge. Ratings are Google's, shown as a count only; we do not copy reviews. Prices are not shown because they change; see the venue's site. Is something wrong, or has it closed? Email contact@saunasnear.com and we will fix it.