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Fairmont Sonoma Mission Inn & Spa, Sonoma: Sit back and relax or jump right in. The main pool averages 88 degrees. Day passes are available Monday through Friday and can be booked through the resort, or Daycation and ResortPass. 100 Boyes Blvd., Sonoma, 707-938-9000, fairmont.com/sonoma (Courtesy of Fairmont Sonoma Mission Inn & Spa)
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The geothermal mineral pools at the Willow Stream Spa flow from more than 1,000 feet below the surface. The spa pools and hot tub are open year-round for guests 18 years and older. There is a $49 fee for hotel guests to use the spa facilities. Non-resort guests pay $149. The access fee may be waived when booking a spa treatment, depending on the service selected, time and availability. (Courtesy of Fairmont Sonoma Mission Inn)
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The Lodge at Sonoma, Sonoma: Enjoy the spirit of summer at the main pool and hot tub. If you are not staying at the hotel, you can purchase a day pass to the pool through ResortPass. 1325 Broadway at Leveroni and Napa Roads, Sonoma, 707-935-6600, lodgeatsonoma.com (Courtesy of The Lodge at Sonoma)
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MacArthur Place, Sonoma: Surrounded by trees and blooming gardens, this midcentury modern pool offers a quiet spot to soak up some vitamin D or make a splash. Day spa guests, who have booked a 50-minute spa treatment at The Spa at MacArthur, are welcome to use the pool. 29 E. MacArthur St., Sonoma, 707-938-2929, macarthurplace.com (Courtesy of MacArthur Place)
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Gaige House, Glen Ellen: The serene setting along Calabazas Creek ensures a relaxing day in the pool or hot tub. Bring that book you’ve been meaning to read for the longest time. 13540 Arnold Drive, Glen Ellen, 707-935-0237, thegaigehouse.com (Courtesy of Gaige House)
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Olea Hotel, Glen Ellen: This pool (heated year-round) and hot tub are open 24/7. It is only accessible to hotel guests. 5131 Warm Springs Road, Glen Ellen, 707-996-5131, oleahotel.com (Courtesy of Olea Hotel)
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Kenwood Inn & Spa, Kenwood: In addition to the main pool and hot tub, this resort also features a warming pool. Cabana rentals are available Monday through Thursday for non-resort guests on ResortPass. Spa guests who book a massage can add on pool access Monday through Thursday for $50. 10400 Sonoma Highway, Kenwood, 707-833-1293, kenwoodinn.com (Courtesy of Kenwood Inn & Spa)
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Flamingo Resort, Santa Rosa: After a $20 million renovation in 2021, the Flamingo Resort boasts a pool area that is poised to be more popular than ever. Hotel guests receive a wristband at check-in for pool access, and non-hotel guests can purchase day passes for the pool on ResortPass. Day guests are restricted to adults 21 and over; children are only permitted as hotel guests. Pool passes range from $38 to $54 depending on the day. 2777 Fourth St., Santa Rosa, 707- 545-8530, flamingoresort.com (Stephanie Russo / Flamingo Resort)
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Vintners Resort, Santa Rosa: This pool, located just outside the property’s Vi La Vita Spa, is for adults only. The spa also boasts an indoor caldarium with a heated soaking pool for guests 18 years and older. If you're not staying at the hotel, but have an appointment at the spa, you get access to the pool and all spa amenities. 4350 Barnes Road, Santa Rosa, 707-575-7350, vintnersresort.com (Courtesy of Vintners Resort)
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Farmhouse Inn, Forestville: Named among the best hotels in the country this year, this family-run inn has a lovely pool which is heated from April to October, depending on the weather. The hot tub is toasty year-round. Only accessible to hotel guests. 7871 River Road, Forestville, 707-887-3300, farmhouseinn.com (Courtesy of Farmhouse Inn)
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The Stavrand Russian River Valley, Guerneville: A day by the pool and hot tub at The Stavrand comes with views of the property’s awe-inspiring redwoods. 13555 Highway 116, Guerneville, 707-869-9093, thestavrand.com (Courtesy of Emma K. Morris)
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Boon Hotel & Spa, Guerneville: This saline pool is a popular spot to unwind with a good book or glass of wine. If the pool is not too crowded, day spa guests are permitted to use the pool and hot tub for a maximum of two hours before or after their spa treatment. 14711 Armstrong Woods Road, Guerneville, 707-869-2721, boonhotels.com (Courtesy of Boon Hotel & Spa)
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The Madrona, Healdsburg: Located in the center of the property, the saltwater pool is flanked by citrus groves and the estate garden. Food and beverage service is available poolside. 1001 Westside Road, Healdsburg, 707-395-6700, themadronahotel.com (Courtesy Daniel Seung Lee)
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Harmon Guest House, Healdsburg: This solar-heated pool’s creekside location has a peaceful vibe and plenty of shade thanks to surrounding trees. Only accessible to hotel guests. 227 Healdsburg Ave., Healdsburg, 707-922-5449, harmonguesthouse.com (Courtesy of Harmon Guest House)
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Hotel Healdsburg, Healdsburg: Surrounded by a garden with roses, hydrangea, olive and fig trees, it’s easy to lose a day relaxing by the 60-foot pool and bubbling hot tub. Only accessible to hotel guests. 25 Matheson St., Healdsburg, 707-431-2800, hotelhealdsburg.com (Courtesy of Hotel Healdsburg)
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H2hotel, Healdsburg: Located steps away from the lobby, this pool is flanked by comfy loungers. Only accessible to hotel guests. 219 Healdsburg Ave., Healdsburg, 707-431-2202, h2hotel.com (Courtesy of h2hotel)
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Hotel Trio, Healdsburg: The pool and neighboring bocce court are located in the center of the hotel property. Outside seating, fire pits and gas barbecue grills make the nearby patio area a favorite spot to enjoy the end of the day. Only accessible to hotel guests. 110 Dry Creek Road, Healdsburg, 707-433-4000, hoteltrio.com (Courtesy of Hotel Trio)
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Graton Resort & Casino, Rohnert Park: Live DJ entertainment by the pool is available daily along with food and drinks served poolside, which can be enjoyed on a plush daybed (starting at $150) or inside a private cabana (starting at $250). Pool day passes, which include one beverage with purchase, are $50 and are available at the resort's gift and lobby shops. Must be a guest at the hotel or spa, have a pool day pass, or have daybed/cabana reservations to access the pool. Pool guests must be 21 or older. 288 Golf Course Drive, Rohnert Park, 707-588-7100, gratonresortcasino.com (Kent Porter / The Press Democrat)
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Francis Ford Coppola Winery, Geyserville: Although you can't stay overnight at this winery, its 3,600 square-foot pool still deserves a spot on this list. Swimmers and sunbathers can dry off and play bocce ball, dine at the Pool Café or Rustic restaurant and head inside the winery to visit the tasting room or check out Coppola’s collection of movie memorabilia. Cabine reservations are required. 300 Via Archimedes, Geyserville, 707-857-1471, thefamilycoppola.com (Courtesy of Francis Ford Coppola Winery)