Sub-alpine terrain near which tree growth dissipates.

Credit: Crested Butte Avalanche Center

Near treeline is the middle transitional elevation band near which tree growth dissipates. Near treeline, or sub-alpine terrain, is characterized by sparse glades of trees and snowpack characteristics that transition between highly wind affected above treeline and more sheltered below treeline terrain. The specific elevation of treeline changes with latitude, from near 12,000 feet in the Southern Rockies to around 6,000 feet in the Northern Rockies to below 1,500 feet in Alaska.

Near treeline is characterized by sparse trees or stunted tree growth.  Credit: Crested Butte Avalanche Center

The snowpack near treeline transitions from highly wind affected above treeline to more sheltered below treeline. Credit: Crested Butte Avalanche Center

A near treeline avalanche starting zone. Credit: Crested Butte Avalanche Center