Idaho Hot Springs

Roystone Hot Springs - Sweet, Idaho

Since the 1800s, Roystone Hot Springs has been sought out by settlers, soakers, old-time laundry scrubbers and Indians in nearby fish camps. Featuring geothermal springs naturally flowing at 143 degrees straight from the ground, Roystone has always been a favorite local hot spot.

Roystone Hot Springs Pictures

Roy Stone Hot Springs Geothermal Steam Sun and steam
Covered Hot Pool Covered hot pool
Roy Stone Historical Photo Historical photo of Roystone Hot Springs

Roystone Hot Springs Facilities

Main Pool

The natural hot springs pool is the perfect temperature all year, from 93 degrees in the summer to a steamy 98 degrees in winter. Roystone operates by reservation so you have the entire 50 foot pool private just for your group. Enjoy the waterfall massage or play water basketball. The pool has a covering and a privacy fence, but you can still watch the deer and see the sunset. Dressing rooms are poolside.

Hot Tub

Roystone features a naturally heated, jetted hot tub that seats up to 12 people. It is kept at about 104 degrees. Reserve a session after dark and enjoy a movie on the outdoor projector while you soak. It includes a private patio and large heated dressing rooms with showers. Reserve the hot tub separately or with the pool, party room, grounds, or event center.

Combine your swim with a picnic on the spacious grounds and enjoy our new basketball/pickleball court, volleyball, hot springs splash pad, fully equipped sports closet, lighted shelters, fire pits and Dutch oven cook area. Make memories here with reunions, large group campouts, parties, or weddings.

The uniquely decorated party room can be rented by the hour or by the day. It is heated and air conditioned with plenty of tables and chairs, couches, and a big screen TV. It includes a patio and is adjacent to the hot tub.

Event Center

The beautiful event center is the perfect venue for large groups. Host your most memorable events here with the double kitchen, banquet room, comfortable TV room, and ample furnishings. A private lawn is included beyond the covered porch with a firepit and bench seating.

RV Park

Each of the 10 RV sites include full hookups, a fire pit, picnic table, and large section of turf. RV guests have private showers, a laundry, playground, walking path, and access to all the grass unless it has been reserved by a private group.

History of Roystone

Throughout its many owners, Roystone Hot Springs has shown its amazing versatility. The fertile land around the mineral springs has been farmed using the warm water for irrigation. The fine vegetables, muskmelons and the orchard were known throughout the Boise Basin.

Later, locals worked to divert the many springs into one cemented catch basin and then built the same swimming pool still used at Roystone today. A photograph from 1909 shows long-skirted women standing next to the pool with laundry barrels and a loaded down clothesline -catching up on work after a swim.

Roystone Hot Springs was then purchased by a man named Roy Stone. He and his nurse turned wife, Eva, purchased it hoping that the healing waters would improve his poor health. Sadly, before he was able to make the move from Portland, he died, leaving it to Eva and her son. She named it in his honor and then built a sanitarium open to all who wished to utilize the mineral springs for their health.

After 2 fires and several more owners, the neglected hot springs were purchased by the Johns Family in the early 80s. Major remodeling and reconstruction of the pool, main house (originally used as a sanitarium and hotel) and surrounding areas have made Roystone what it is today.


Located in Sweet, ID halfway between Emmett and Horseshoe bend and about 45 minutes from almost anywhere in the Treasure Valley.