Roystone Hot Springs
- Call for prices
- 98–104°F
- 59 min from Boise
- Reservations required
A family-run hot springs RV park near Sweet with an outdoor pool under a vaulted roof and a jetted hot tub, each rented to one group at a time. The pool is about 98°F in winter and cooled in summer, and the hot tub runs about 104°F. The property is alcohol-free outside the Spring House event area.
- Price
- Call for prices
- Water
- 98–104°F
- Nearest town
- Sweet
- From Boise
- 59 min
- Reservations
- Required
Plan your visit
Hours & season
| Hours | Non-camping guests must leave 10:30pm-8am |
|---|---|
| Season |
|
Tickets & booking
| Price |
|
|---|---|
| Access | Reservation required |
| Booking |
|
Rules
| Ages |
|
|---|---|
| Dogs | No |
On site
| Pools | 2 |
|---|---|
| Lodging | Yes |
Not stated by the venue: swimwear.
Water temperature
Soaking-pool temperatures as published by the venue or land agency; they vary with season and flow.
Mineral profile
Total dissolved minerals
575 mg/L
Moderately mineralized · Sodium–sulfate (sodium sulfate water)
- pH
- 7.85
- Temp at source
- 139°F
- Lithium
- 0.22 mg/L
- Fluoride
- 16 mg/L
- Boron
- 0.71 mg/L
Lab analysis of the source water at “07n 01e 08daa1s Roystone Hot Sps”, sampled 1972–1979 by the USGS and partners (data). Pool water may be cooled, mixed or treated, and spring chemistry is generally stable over decades. We report measurements only; we don't make health claims.
The pools
| Pool | Temp | Depth | Setting |
|---|---|---|---|
| PoolAbout 98F in winter, cooled in summer; 3-6 ft deep; open sides | 98°F | 6 ft | Covered |
| Hot TubAbout 104F; jets; seats 12; no children 8 and under | 104°F | — | Outdoor |
As published by the venue. Temperatures shift with the seasons and the weather.
Facilities
| Bring your own alcohol | Not allowed |
|---|---|
| Glass containers | Not allowed |
| Smoking | Not allowed |
| Good to know |
|
What's here
- covered outdoor pool 3-6 ft deep
- 12-person jetted hot tub
- exclusive use per booking
- year-round RV park
- guest house
- event center
Getting there
- From Boise59 min38 mi
- From Boise (BOI)1 hr 7 min41 mi
Typical driving time without traffic or snow.
| Elevation | 2,514 ft |
|---|---|
| Road |
|
Things to do near Sweet
Black Canyon Dam / Triangle Park
Reclamation reservoir area on the Payette River with boating and picnicking
Montour Wildlife Management Area
Idaho Fish and Game area for wildlife viewing, walking and biking
Nearby springs
Hot Springs Campground Hot Spring
A natural hot springs soaking pool on the South Fork Payette River, across the Banks-Lowman Road from the Forest Service's Hot Springs Campground and down a staircase. The campground east of Garden Valley is open from early May to the end of September and is reserved through Recreation.gov.
Terrace Lakes Resort
A golf resort in Garden Valley with an outdoor geothermal pool open year-round to day visitors without reservations. The resort also has a restaurant and lounge, motel rooms, cabins, condos and RV spots. Drinks bought on site can be taken to the pool area with a wristband.
The Springs
A geothermal soaking venue on Highway 21 about a mile south of Idaho City, with an 80 by 40 ft main pool, a hot tub and private tubs. All visits are by reservation in 2.5-hour sessions, and several days and evenings are adults-only. Poolside food, beer and wine are served, and the owners run Inn The Pines lodging a third of a mile away.
Hot Springs Campground Hot Spring: 23 mi · Terrace Lakes Resort: 23 mi · The Springs: 26 mi
Sources (7)
· checked November 2026
Prices, hours and rules are checked against the official site and land-agency pages. Spot something out of date? Let us know.