Gigantic Warm Springs
Gigantic Warm Springs is a developed thermal spring listed in Fergus County, Montana Hot Springs near Lewistown. Reported soak temperature is 68°F with a historical source temperature of 68°F — actual conditions may differ. Access is subject to admission fees, and clothing policy is listed as swimsuit-required — always confirm before visiting. Explore nearby springs with our GPS Springs Near Me Finder.
Seasonal Soaking & Best Time to Visit
While geothermal pool temperatures remain a constant 68°F year-round, outdoor ambient temperatures fluctuate significantly across Montana. Late spring through autumn offers the most comfortable road access.
Fact Sheet & Geothermal Specifications
| Reported Soak Temp | 68°F |
| Source Temp (Historical) | 68°F |
| Trail Access | Recorded coordinates — access unverified |
| Access Fee | Paid / Resort Fees |
| Clothing Policy | Reported Clothing Required |
| Pet Policy | Reported No Pets |
| Geothermal Data Reference | NOAA Thermal Springs List (1980 archive) |
| Check Land Status | Montana Land Manager (BLM) |
Verification & Sources
This record was verified against the following source(s):
Reviewed September 2026 · Treat all details as reported — verify before visiting · How we verify our data
Detailed Description
The 'World's Largest Warm Spring' — ~50,000 gpm of constant 68°F water forming a 100-yard natural swimming basin on a family ranch 14 mi north of Lewistown; lifeguard, decks, picnic tables and camping. A beloved central-Montana summer institution — warm, not hot. Fee: Small entrance fee (~$3-5) at private ranch. 68°F is a warm swim, not a hot soak; primarily summer (Jun-Aug).
Directions & Trailhead Access
749 Warm Spring Lane, Lewistown — ~14 mi north of town, signed.
Frequently Asked Questions: Gigantic Warm Springs
Is Gigantic Warm Springs free?+
Gigantic Warm Springs is a developed thermal facility near Lewistown that requires paid admission.
What temperature is Gigantic Warm Springs?+
Gigantic Warm Springs has a reported soak temperature of 68°F and a historical source temperature of 68°F in survey records. Historical data may not reflect current conditions — always test water before entering.
Is Gigantic Warm Springs clothing optional?+
Gigantic Warm Springs is listed as swimsuit-required in directory records. Confirm current rules before visiting, as policies change.
How do you access Gigantic Warm Springs?+
Gigantic Warm Springs is a recorded location in Fergus County. Exact access, parking, and land status are not verified — check with the local land manager (BLM/USFS/NPS) before visiting.
Where to Stay Near Gigantic Warm Springs
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Community Soaker Reports
Visitor-submitted reports — not independently verifiedNo Community Reviews Yet
Have you soaked at Gigantic Warm Springs? Share your water temperature measurements, pool conditions, and road access tips to help fellow travelers!