Quick FactsOverview
About Roystone Hot Springs
Roystone Hot Springs, Idaho is a family-owned geothermal recreation facility in the small farming community of Sweet in Gem County, approximately 13 miles northeast of Emmett and 35 miles from Boise. Source water at approximately 143 degrees Fahrenheit feeds a 50-foot concrete swimming pool maintained at around 98 degrees and a jetted hot tub at 104 degrees, with no chemical treatment. The facility operates by reservation only with private sessions, meaning your group has the entire pool to yourselves. Emmett, the Gem County seat, is the nearest city with full services.
Roystone has a rich history dating to the 1800s, when Native Americans and early settlers used the springs for bathing, laundry, and irrigation. The fertile land was farmed using warm mineral water, producing vegetables and muskmelons known throughout the Boise Basin. The property is named after Roy Stone, who purchased it hoping the healing waters would improve his health. After his death, his wife Eva named the springs in his honor and built a sanitarium. A 1909 photograph shows women in long skirts doing laundry beside the pool.
The mineral water is sodium bicarbonate type, slightly alkaline at pH 7.5, and entirely natural with no chemical treatment.
Location & Access
Getting to Roystone Hot Springs
Roystone Hot Springs is located in Sweet, Idaho, approximately 35 miles northwest of Boise and 13 miles northeast of Emmett. The drive from Boise takes roughly 50 minutes on paved roads through scenic farmland and low mountain valleys. No hiking is required. On-site parking is adjacent to the pool.
From Boise, take Highway 55 north toward Emmett, then turn right onto Highway 52 east. After a few miles, turn left onto the Sweet-Ola Highway and follow signs to Roystone Hot Springs. The entrance is clearly marked. From Emmett, drive east on Highway 52, then take the Sweet-Ola Highway northeast to Sweet.
Reservations
All visits require a reservation. Private pool sessions, hot tub reservations, and event bookings can be made by phone or through the facility website. For visitors seeking hot springs near Emmett, Roystone is the closest and most accessible geothermal option. The facility is also the nearest hot springs to Boise that offers private, reservation-only sessions without sharing the pool with other groups. The Sweet Valley is a quiet, scenic agricultural area with rolling hills and ranchland. The drive from Boise passes through the small city of Emmett, where fuel, food, and supplies are available before the final stretch.
Suitability & Accessibility
Who Should Visit Roystone Hot Springs
Roystone Hot Springs suits families, groups, and couples seeking a private, comfortable geothermal soaking experience within easy driving distance of Boise. The private session model means your group has the entire 50-foot pool and hot tub exclusively, with no sharing required. At 98 degrees in the pool and 104 degrees in the hot tub, the temperatures are comfortable for extended soaking and swimming.
The facility accommodates groups from small families to large events of 150 or more in the 3,500-square-foot Spring House event center. On-site recreation includes basketball and pickleball courts, volleyball, a splash pad, horseshoes, frisbee golf, and a game room. RV camping (20 full hookup sites) and tent camping are available for overnight stays.
Accessibility at Roystone Hot Springs
The facility has handicap accessibility. The property is flat with parking adjacent to the pool area. Contact the facility for specific details regarding pool entry assistance. Those seeking a hot spring resort Idaho offers near Boise will find Roystone to be one of the most convenient and private options, combining genuine geothermal water with modern amenities and the privacy of a reservation-only system that guarantees exclusive pool access for your group throughout the session.
Safety & Etiquette
Roystone Hot Springs Safety Tips
Roystone Hot Springs is a managed facility with staff available, making it generally safe for all visitors. The pool temperature of 98 degrees and hot tub at 104 degrees are comfortable and pose no scalding risk. Standard pool safety applies. Supervise children at all times near the water. The pool depth accommodates swimming and soaking.
The natural mineral water is untreated. The water is sodium bicarbonate type at pH 7.5. Swimsuits are required. Follow all posted facility rules and staff instructions. Reservations are mandatory for all visits.
Travel and Seasonal Notes
The drive from Boise is approximately 50 minutes on paved roads. The Sweet Valley is a quiet farming community with limited services. Bring any food or supplies you need, as options in Sweet are minimal. Emmett has full services including fuel, food, and lodging.
Facility Guidelines at Roystone Hot Springs
Private sessions only, no walk-ins. The hot tub seats up to 12 people. Evening sessions include access to an outdoor projector for movies while soaking. The RV park accommodates vehicles year 2000 or newer for long-term stays. Pets are allowed in the campground. The event center can be reserved for weddings, reunions, and group gatherings. The property is well-maintained and family-operated with a welcoming atmosphere. Year-round operation means winter evening soaks under starry skies are especially popular. The mineral water has been used continuously for over a century, and the facility combines that heritage with modern recreational amenities.
