Warm Spring
This 79-degree thermal spring sits on Bureau of Land Management lands near Bylas in Graham County, running 15.3 degrees warmer than the regional ambient temperature in an elevational zone where desert transitions to oak-juniper woodland.
The spring requires a short walk of approximately 1,400 feet to reach from the nearest road. The landscape features large mesquite trees interspersed with desert grasses and scattered oak, creating dappled shade typical of the Galiuro foothills. Water emerges amid this riparian vegetation at 4,394 feet elevation.
The spring lies within the Aravaipa Canyon Special Recreation Management Area. Fourmile Canyon Campground sits 17.3 kilometers away and offers first-come, first-served sites. Spring visits work best October through April; summers bring intense heat to lower elevations.
The thermal feature formed through deep groundwater circulation in the transition zone between the Galiuro Mountains and Aravaipa Valley, where geologic structures channel hot water to the surface. This area holds significance for both natural history and cultural use dating to Apache occupation.
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Located among large mesquite trees and desert grasses, the Fourmile Canyon Campground offers a developed setting for an overnight or extended camping trip. Fourmile Canyon Campground is within the Aravaipa Canyon Special Recreation Management Area (SRMA) which includes about 75,000 acres of public lands at the northern end of the Galiuro Mountains in southeastern Arizona. There are 10 individual campsites, which are available on a first come, first served basis. Each campsite includes a conc...
Warm Spring is road-accessible, so you can bring more gear.
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