botanical garden - a facility where trees and shrubs are cultivated for exhibition. arboretum. facility, installation - a building or place that provides a particular service or is used for a particular industry; the assembly plant is an enormous facility.
Keystone, CO Weather. The average temperature of Keystone is 35.80Â°F, which is much lower than the Colorado average temperature of 46.26Â°F and is much lower than the national average temperature of 54.45Â°F. Historical Weather.
The drive time from Keystone to Aspen is approximately 2 hrs., 35 mins. in good weather and light traffic. The distance from Keystone to Aspen is 140 miles. The drive takes you over Vail Pass which is 10,617 feet and is sometimes closed during heavy snow storms.