Incredibly rare. Huge numbers of people hike the PCT in the desert every year, and some years 1 or 2 people die of heat exhaustion. It's never big groups of peo

Incredibly rare. Huge numbers of people hike the PCT in the desert every year, and some years 1 or 2 people die of heat exhaustion. It's never big groups of people at the same time. Same with heat-related deaths at Grand Canyon, Death Valley etc.