The Spa at Solage

The Spa at Solage sits inside the Solage resort on Silverado Trail in Calistoga, built around a 20,000-square-foot bathhouse that taps into Napa Valley's long history of mud and mineral water therapy. The draw here is the water circuit: a cold plunge at 50-55 degrees, an ambient-temperature magnesium pool, a 98-degree relaxation pool, and two jetted pools (saline and mineral) running 102-104 degrees. It's a hot-cold-soak rotation rather than a single treatment room experience.

Beyond the pools, there's a fitness center with PreCor cardio equipment, Paramount strength machines and free weights, plus a movement studio offering complimentary fitness classes throughout the week. Both the gym and studio run daily from 5:30 AM to 9:00 PM, well outside the spa's own 8:30 AM to 6:30 PM hours.

The signature treatment is the Mudslide, a nod to the region's volcanic ash mud traditions that have attracted visitors since the 1800s. The spa is adults-only and geared toward couples as much as solo visitors, fitting its Upscale price tier and resort setting. A day pass is available for those not staying overnight, making the pools and fitness facilities accessible without a hotel booking.

This is a resort spa built for unwinding over a few hours rather than a quick treatment stop. Anyone booking should confirm current day-pass pricing and what it includes, since specifics weren't listed beyond the pass being offered.