Just down the road from Sage Lodge, a hotel that predates it by more than 100 years sits around a swimming pool filled by naturally heated springs. Even before the gold miners came here to soak, Native American tribes used the spot to warm up midhunt. Day passes available.
Park the car in Montana, but hoof it down the river into Wyoming to plunge in where thermal springs meet the Gardner River. With steam that settles over scenic sagebrush and artful old wood fences—and sometimes a bison or two—it’s a site that basically boasts its own flattering Instagram filter.
The lonely stretch west of Bozeman and south of Butte is a long way from a blue state, but a distinct hippie flavor hangs over the outdoor pool overseen by Buddha statues. The compound’s bluegrass concerts, kombucha, and homegrown kale salads just boost the vibe.