The best time to visit the Grand Canyon just may be in mid-Fall. On my longest out-and-back backpacking trip to date, I trekked vertical miles through riparian, desert, and subalpine climates. Montane meadows, conifer and ponderosa pine forests. Every habitat variety from Canada to Mexico was represented; as well as every season. Winter on the North Rim. Fall in the base of the canyon. Summer in the river corridor.