Data files for manuscript titled "Thermal tolerance regulates foraging behavior of ants". Over two years, we tracked 322 foraging trips from 15 red harvester ant colonies in a mixed grass prairie of southwestern Oklahoma. During each trip, we measured surface temperature, distance, time, worker mass, seed mass, and foraging tempo (i.e. running speed). To assess P. barbatus heat tolerance, we measured CTmax and knock-down resistance of field-collected workers in the lab.