Twin Springs Resort
By the HotSpringsFind editorial team · How we compile records · Reviewed September 2026
Twin Springs Resort is a resort hot spring listed near Boise, Idaho. Reported soak temperature: 104°F. See the visit fact sheet.
Current status
Rustic off-grid resort 26.6 mi up a washboarded dirt road along the Middle Fork Boise River; sulfur-free geothermally-heated private hot tubs (one per cabin) plus a shared steam sauna — for REGISTERED GUESTS ONLY, no public day use; cabins $100-160/night (2-night min, non-refundable deposit by check/money order), reachable only by email — no phone or cell service.
Checked September 2026 · verified on the operator’s site · 6 sources ↓
Staying overnight?
Useful before or after the Idaho loop, rather than as a room beside the remote springs.
Boise is about 25 mi from the spring (straight line).
We may earn a commission from bookings through these links, at no extra cost to you.
Before you go
- Status: Reservation or permission required — confirm via Twin Springs Resort — official FAQ (rates, deposits by check, 2-night min, pet policy, no phone).
- Cost: Fees reported — confirm current rates before visiting.
- Getting there: Developed resort — confirm operating hours and any reservation requirement.
- Water: Reported soak temperature 104°F — always test the water before entering.
- Rules: Reported clothing-optional; reported dog-friendly.
- Conditions: check weather, fire closures, and land-manager alerts the week you go — mountain access changes seasonally.
- Reservations/permits: Reservation = your permit. Email twinspringsresortidaho@gmail.com; mail check/money order deposit within 7 days.
- Booking: Reservation required.
- Best time to go: Year-round — geothermal-heated cabins marketed for winter stays; midweek for solitude. Road is the gating factor in storms.
- Clothing reality: Official: clothing optional in private areas (each cabin has its own deck hot tub); shared sauna — suits customary. Legal: private property, guest discretion in private spaces.
- Kids: Allowed.
- Cell service: none — download maps and tell someone your plan.
- Accessibility: Rustic riverside cabins on uneven natural terrain at the end of a long dirt road — not mobility-friendly; no accessibility claims.
- NO day use — hot tubs and steam house are for overnight guests only
- 26.6 miles of dirt road from Hwy 21 — graded but often washboarded, narrows to one lane; higher-clearance vehicle recommended; NO services en route
- No phone number and no cell service — EMAIL ONLY: twinspringsresortidaho@gmail.com
- Deposits must arrive within 7 days BY CHECK OR MONEY ORDER — no online payment
- Deposits are technically non-refundable (applied to stay)
- 2-night minimum stay; check-in 3pm / check-out noon
- Kids 12 & under $20/night; 13+ billed as adults ($30 extra-adult fee)
- Pets $20 one-time fee each, leashed outside
- Gatehouse has no electricity (propane lights/fridge/stove) — bring a generator if needed
- Rockhouse has no kitchen — bring camp stove or grill food
- Hazard: 26.6-mi remote dirt road — washboard, single-lane stretches, no services; breakdown = long wait
- Hazard: No cell service anywhere at the resort or en route
- Hazard: Winter storms can make the Middle Fork road difficult/impassable
- Hazard: River-adjacent property — standard river-safety caution
About this spring
Historic 1898 resort on the Middle Fork Boise River — a sulfur-free 180°F source piped to private riverside hot tubs on each cabin deck plus a rock steam house; tavern and store on site. NO DAY USE — tubs are for cabin guests only. Fee: Overnight cabin guests only — NO day use. No day use whatsoever; no cell service; dirt road can be rough/icy.
Twin Springs Resort is a remote, historic retreat on the Middle Fork Boise River in Boise County — about 45 miles northeast of Boise and 40 miles southeast of the old mining town of Atlanta — reached by roughly 26 miles of dirt road with no cell service. The surrounding mountains were worked hard during the late-1800s gold rush: the 'Glory Hole' diggings and wooden sluice-line timbers still litter the slopes, and the property's original cabin served generations as store, school, lodging and kitchen. A sulfur-free geothermal source emerges from a cliff at about 180°F and is piped directly to private riverside hot tubs — one on each cabin's deck — cooling to soaking temperature en route; a rock steam house and sauna serve registered guests. Soaking is strictly for overnight guests in three two-bedroom riverfront cabins, the propane-powered Gatehouse and the stone Rockhouse; no day use is offered. A tavern and small store operate on site, and the resort runs on a home-built hydropower system.
Directions & trailhead access
2538 Middle Fork Rd — Hwy 21 to Mores Creek bridge, then Middle Fork Boise River Rd ~19-27 mi graded dirt toward Atlanta.
Idaho geothermal context
Idaho's thermal water rides the old track of the Yellowstone hotspot across the Snake River Plain and surfaces along faults in the surrounding mountains. Many of the best soaks are roadside or river-access pools inside national forests — including springs that only emerge when river levels drop. Backcountry sites demand real navigation skills and long dirt-road drives.
What a resort site means here
A resort spring is a commercial operation: developed pools or tubs with controlled temperatures, changing facilities, and usually day-use fees or lodging packages. Expect posted rules (swimsuits, quiet hours, age limits), staff on site, and in many cases required reservations — especially on weekends and holidays.
Best time to visit
Year-Round (Best: May – October)Pool temperatures and access can change with weather and season. Outdoor ambient temperatures fluctuate significantly across Idaho. Late spring through autumn offers the most comfortable road access.
Fact sheet
| Reported soak temp | 104°F |
|---|---|
| Source temp (historical) | 104°F |
| Trail access | Recorded coordinates — access unverified |
| Access fee | Fees reported |
| Clothing policy | Reported clothing-optional |
| Pet policy | Reported dog-friendly |
| Geothermal data reference | NOAA Thermal Springs List (1980 archive) |
| Check land status | Twin Springs Resort — official FAQ (rates, deposits by check, 2-night min, pet policy, no phone) |
Twin Springs Resort FAQ
Is Twin Springs Resort open right now?
Rustic off-grid resort 26.6 mi up a washboarded dirt road along the Middle Fork Boise River; sulfur-free geothermally-heated private hot tubs (one per cabin) plus a shared steam sauna — for REGISTERED GUESTS ONLY, no public day use; cabins $100-160/night (2-night min, non-refundable deposit by check/money order), reachable only by email — no phone or cell service. (Status verified on the operator’s site, last checked September 2026.)
Is Twin Springs Resort free?
Twin Springs Resort is listed with reported fees near Boise. Fees are reported; confirm admission, parking and permit costs with the site manager.
What temperature is Twin Springs Resort?
Twin Springs Resort has a reported soak temperature of 104°F and a historical source temperature of 104°F in survey records. Historical data may not reflect current conditions — always test water before entering.
Is Twin Springs Resort clothing optional?
Twin Springs Resort is listed as traditionally clothing-optional in directory records. Confirm current rules before visiting, as policies change.
How do you access Twin Springs Resort?
Twin Springs Resort requires permission, a permit or advance booking — confirm the terms with the site manager before visiting.
Where to stay in Boise
Useful before or after the Idaho loop, rather than as a room beside the remote springs.
Boise is about 25 mi from the spring (straight line).
We may earn a commission from bookings through these links, at no extra cost to you.
Sources & references
- Twin Springs Resort — official FAQ (rates, deposits by check, 2-night min, pet policy, no phone) — operator · 2026
- Twin Springs Resort — official Getting Here (26.6-mi dirt road directions) — operator · 2026
- Twin Springs Resort — official Activities (hot tubs/steam house for rental guests only) — operator · 2026
- Twin Springs Resort — official Cabin Rentals (private hot tubs per cabin) — operator · 2026
Additional references for this record; a source link does not guarantee current conditions.
Details above were verified against the named sources on their listed dates — conditions change, so recheck before traveling. · How we verify our data · Report a correction
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