Greylock Hot Springs
By the HotSpringsFind editorial team · How we compile records · Reviewed September 2026
Greylock Hot Springs is a primitive hot spring listed near Atlanta, Idaho. Reported soak temperature: 103°F. See the visit fact sheet.
Current status
Small user-built riverside pools on the Middle Fork Boise River just east of Atlanta in Boise National Forest — the last drive-up soak on the road; reachable by a rough unpaved forest road that is effectively snowbound Nov-May.
Checked August 2025 · based on recent visitor reports · 3 sources ↓
Before you go
- Status: Open — last verified below — confirm via HotWaterSlaughter — Greylock Hot Springs (drive-up, year-round pool description, no camping).
- Cost: Reported free access — fees and permits can change, confirm before visiting.
- Getting there: No verified hike distance on record — confirm the route and road conditions.
- Water: Reported soak temperature 103°F — always test the water before entering.
- Rules: Reported clothing-optional; pets reported not allowed — confirm current rules.
- Conditions: check weather, fire closures, and land-manager alerts the week you go — mountain access changes seasonally.
- Reservations/permits: None required; Boise National Forest public land.
- Best time to go: July-September for reliable road access and usable pools; weekends draw crowds from the Atlanta campgrounds — weekday mornings quieter.
- Clothing reality: No posted policy; suits customary at this roadside site.
- Kids: Allowed.
- Cell service: none — download maps and tell someone your plan.
- Accessibility: Roadside pull-out but down a short embankment to river-level pools; not wheelchair accessible.
- ROAD IS THE HAZARD: Middle Fork Boise River Road (FR-268) is rough, narrow, no guardrails — high-clearance/4WD recommended; not plowed in winter (Nov-May essentially snowmobile/ski only)
- No camping at the springs themselves; Powerplant/Middle Fork trailhead parking and Atlanta-area campgrounds nearby
- Pools are small and shallow; temps vary — some too hot (source ~106-115F), some too cold; users channel river water to temper
- Spring runoff can submerge the riverside pools early season
- Very limited services in Atlanta; no cell coverage on the road
- 80+ miles of unpaved road from Boise via Arrowrock Reservoir; the shorter Crooked River/NF-384 route is closed in winter
- Hazard: Rough, narrow mountain road with steep unguarded drops
- Hazard: Winter closure — snowmobile access only Nov-May
- Hazard: Hot source water mixed unevenly in pools
- Hazard: River fluctuation can flood pools
- Hazard: No services/cell coverage for ~80 miles
About this spring
The last drive-up soak on the Middle Fork Boise River east of Atlanta — hot water (~110-115°F) runs through rocky channels into shallow dug-out pools at the river's edge (~100-106°F when usable). Reliable only mid-late summer once river levels drop; otherwise underwater. Pools submerged during spring runoff/high water. Rough dirt road.
Greylock Hot Springs is the last drive-up-and-soak spring on the Middle Fork of the Boise River, sitting at about 5,460 feet east of the historic mining town of Atlanta in the Boise National Forest. Hot water — reported in the 110-115°F range — runs through rocky channels toward the river and collects in shallow dug-out pools; regulars have built small river-water inflows to temper the soak into the 100-106°F range. The pools are reliable only in mid-to-late summer once river levels drop and are otherwise underwater. No camping is allowed at the springs themselves.
Access is via the rough, unpaved Middle Fork Boise River Road (FS-268), a high-clearance route that is not plowed in winter; the whole Atlanta area is effectively snowbound from roughly November through May, reachable then only by snowmobile, snowcat, or ski. Greylock is one of several springs on this stretch — Atlanta Hot Springs and Chattanooga Hot Springs lie close by and can remain usable when Greylock is submerged.
Directions & trailhead access
From Atlanta, Middle Fork Boise River Rd (FS-268, rough gravel) east past Powerplant Campground; pools at the river edge just off the road.
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 primitive site means here
Primitive springs have no facilities: no changing rooms, no trash service, often no maintained road to the pool. Expect natural rock or gravel bottoms, water temperature that varies by spot and season, and other visitors who may treat the site informally. Pack out everything you bring, test the water before entering, and leave the pool cleaner than you found it.
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 | 103°F |
|---|---|
| Source temp (historical) | Not reported |
| Trail access | Recorded coordinates — access unverified |
| Access fee | Reported free — verify locally |
| Clothing policy | Reported clothing-optional |
| Pet policy | Reported no pets |
| Geothermal data reference | NOAA Thermal Springs List (1980 archive) |
| Check land status | HotWaterSlaughter — Greylock Hot Springs (drive-up, year-round pool description, no camping) |
Greylock Hot Springs FAQ
Is Greylock Hot Springs open right now?
Small user-built riverside pools on the Middle Fork Boise River just east of Atlanta in Boise National Forest — the last drive-up soak on the road; reachable by a rough unpaved forest road that is effectively snowbound Nov-May. (Status based on recent visitor reports, last checked August 2025.)
Is Greylock Hot Springs free?
Greylock Hot Springs is listed as free to access in Elmore County, Idaho. Fees and rules change — verify current status with the land manager before visiting.
What temperature is Greylock Hot Springs?
Greylock Hot Springs has a reported soak temperature of 103°F. Historical data may not reflect current conditions — always test water before entering.
Is Greylock Hot Springs clothing optional?
Greylock Hot Springs is listed as traditionally clothing-optional in directory records. Confirm current rules before visiting, as policies change.
How do you access Greylock Hot Springs?
Greylock Hot Springs is on public land — verify current road access, fees and rules with the land manager before visiting.
Sources & references
- Ramblin' Recon trip report — visited Greylock Aug 2025 (shallow pools, usable) — community · 2025-08
- HotWaterSlaughter — Greylock Hot Springs (drive-up, year-round pool description, no camping) — community · 2020
- Hot Springs Locator — Atlanta access notes (MF Boise River Rd not plowed in winter) — community · 2024
- Ordealist — Atlanta Road / Middle Fork Boise River road guide — community · 2024
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
Your private trip notes
Saved only in this browser — not published or shared.No private notes yet
Keep access details and observations for your own planning.