Guides / Hot tubs, saunas and plunges · Updated
Cold plunge temperature
From peer-reviewed research and the National Weather Service, checked November 1, 2026.
Short answer
Research on cold-water recovery found the best results with water at 10 to 15 °C (50 to 59 °F). Colder isn’t automatically better, and the first minute is the risky part: cold shock can hit at those same temperatures.
What the studies found
A 2016 review and meta-analysis of cold water immersion for muscle soreness (Machado and colleagues, Sports Medicine) found “water temperature of between 10 and 15 °C demonstrated the best results”, and concluded cold water immersion “can be slightly better than passive recovery”, with an immersion time of 11 to 15 minutes giving the best results in those studies.
Cold shock
The National Weather Service: “Cold shock can be just as severe and dangerous from water temperatures of 50-60°F (10-15°C).” A 1991 study by Tipton and colleagues found the first responses to 10 °C water “can represent as great a threat as those in water at 5°C.” The gasp and fast breathing are worst in the first minute. Get in slowly, never plunge alone, and talk to a doctor first if you have a heart condition.
Getting it there
Most chillers bottom out at 37 °F. The chiller calculator shows how long yours takes to reach your target.