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.
Major cities near Keystone, CO. This is a list of large cities closest to Keystone, CO. A big city usually has a population of at least 200,000 and you can often fly into a major airport. If you need to book a flight, search for the nearest airport to Keystone, CO. 1  52 miles to Denver, CO. 2  60 miles to Aurora, CO. 3  80 miles to Colorado Springs, CO. 4  315 miles to Albuquerque, NM. 5  470 miles to Lubbock, TX.