As global temperatures rise, increasing numbers of individuals will work in hot environments. Interventions to protect their health are critical, as are reliable methods to measure the physiological strain experienced from heat exposure. The physiological strain index (PSI) is a measure of heat strain that relies on heart rate and core temperature but is challenging to calculate in a real‐world occupational setting. This study provides critical information on risk factors for elevated heat strain for agricultural workers and suggests a practical approach for using PSI in field‐based settings.

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