This paper uses over 30 million individual-level trips in federal recreation loca- tions to investigate the impact of temperature on outdoor recreation activities. Our results show that a 1◦F temperature increase during the last 6 months increases the total trip duration by 0.685 days (or a 2.36% increase) and the total number of trips by 0.262 (or a 3.02% increase) at the zipcode-month level. The positive effect is primar- ily driven by the increased number of trips and more in-state travel. We find that the impact of temperature on recreation activities generally increases under a higher temperature. When the monthly temperature is below < 40◦F, the temperature increase will reduce the number of trips as individuals in low-temperature regions are likely to reduce travel demand when the temperature gets warmer. We show that a 1◦F increase in the current mean temperature will contribute to about US $20.93 billion to $26.79 billion additional economic benefits in the outdoor recreation sector, although potential damage from temperature increase still outweighs the benefit.