Lodgepole pine forests interspersed with stands of quaking aspens are fire-resilient forests that dominate the central and north-central Rocky Mountains. Usually found between in Colorado, lodgepole pines and aspens grow rapidly after fire in mostly even-aged stands. In the Canadian Rockies, the lodgepole pine/quaking aspen forests occur in the foothills, mixed with white spruce and balsam poplar. In the northern Canadian Rockies, black spruce also occurs in this biotic zone.