Outdoors NearbyBoulder Hot Springs
Historic hotel and bathhouse on about 300 acres south of Boulder, with an outdoor pool and indoor hot and cool plunges. The outdoor pool is sanitized with bromine rather than chlorine. Boulder Hot Springs sells day passes, so you don't need to stay overnight.
| Access | Day passes for the public Day passes cover the outdoor pool plus indoor plunges and steam rooms (separate women's and co-ed sides). The property is alcohol-, drug- and smoke-free; showers required before soaking. |
|---|---|
| Type | Hot springs resort |
| Location | Boulder, MT Managed by Private operator Directions (approximate location; check the official map) |
| Water | outdoor pool about 96–100 °F; indoor hot plunges 103–106 °F; women's cool plunge usually under 70 °F |
| Prices | Adult, weekday: $12 (Mon–Fri) Senior 60+, weekday: $10 Child 3–12, weekday: $7 Adult, weekend & holiday: $14 Senior 60+, weekend & holiday: $12 Child 3–12, weekend & holiday: $8 Checked October 2026 on the operator's site |
| Hours | 10 am–8 pm daily for day use |
| Ages | children under 12 must be with an adult |
| Facilities | changing rooms, restrooms, steam rooms, lodging |
| Website | boulderhotsprings.com |
| Phone | (406) 225-4339 |
Best time to soak: Boulder Hot Springs
Hot water is most welcome on cold days. From October to April average highs near Boulder stay at 34 to 57 °F, with nights down to 12 °F. Freezing nights from October to April mean icy steps and possible road closures; traction for your shoes helps.
| Month | High | Low | Rain days |
|---|---|---|---|
| Jan | 35 °F | 12 °F | 1 |
| Feb | 38 °F | 14 °F | 1 |
| Mar | 47 °F | 21 °F | 1 |
| Apr | 55 °F | 27 °F | 2 |
| May | 64 °F | 35 °F | 5 |
| Jun | 72 °F | 43 °F | 6 |
| Jul | 83 °F | 48 °F | 5 |
| Aug | 82 °F | 46 °F | 4 |
| Sep | 72 °F | 38 °F | 3 |
| Oct | 57 °F | 28 °F | 2 |
| Nov | 42 °F | 19 °F | 2 |
| Dec | 34 °F | 12 °F | 1 |
More to do nearby
- Butte Community Ice Center (indoor ice rink, 24 mi)
Pack for the hot springs
-
Illustration SIMARI quick-dry water shoes for women and men Grip on slick rock and gravel pool bottoms, and they dry fast on the walk out. View on Amazon - Cold-day pick SUN CUBE hooded changing robe poncho Change in and out of a wet suit at a trailhead with no changing room, and stay warm after a winter soak. View on Amazon
- Earth Pak roll-top waterproof dry bag Keeps your phone, keys and dry clothes safe on wet rocks next to the pool. View on Amazon
We haven't tested these ourselves; we chose them by size and specs. As an Amazon Associate we earn from qualifying purchases, at no extra cost to you. Check the current price on Amazon.
Other hot springs near Boulder
- Broadwater Hot Springs & Fitness Day pass
- Fairmont Hot Springs Resort Guests only
- Norris Hot Springs Day pass
- Bozeman Hot Springs Day pass
- Spa Hot Springs Motel Day pass
- Elkhorn Hot Springs Day pass
- Jackson Hot Springs Lodge Day pass
- Chico Hot Springs Resort & Day Spa Day pass
Sources
Access, prices and rules come from these official pages, checked October 2026. Hot springs close for weather, repairs or high water, so confirm before you go.
Something changed? Tell us.
Frequently asked questions
Do you have to pay at Boulder Hot Springs?
Adult, weekday: $12 (Mon–Fri), Senior 60+, weekday: $10 and Child 3–12, weekday: $7, according to the operator as of October 2026. Prices change, so check before you go.
How hot is Boulder Hot Springs?
Outdoor pool about 96–100 °F; indoor hot plunges 103–106 °F; women's cool plunge usually under 70 °F.
When is Boulder Hot Springs open?
10 am–8 pm daily for day use.