Gillard Hot Spring is a thermal spring in Greenlee County, Arizona, notable for water emerging at a high temperature of around 77 °C. It is a wild, open-air site set within Arizona's arid backcountry landscape.
Insider tip — Gillard Hot Spring in the Black Hills Byway area of Greenlee County, Arizona — the HOTTEST natural spring in Arizona, discharging 400–500 gallons/minute at 170–180°F (77–82°C) into the adjacent Gila River. Dangerously hot: view-only, no soaking possible. Accessed via the Black Hills Backcountry Byway from Safford. A remarkable geological spectacle.