The timberline in Colorado varies from approximately 11,000 to 12,000 feet. The precise elevation of the timberline is affected by specifics of climate, slope and the species of tree growing at a given location.
The timberline is a hypothetical line of elevation above which trees cannot grow. Trees near the timberline tend to be very small and are often twisted or scarred by winds. Trees growing at or near the timberline in Colorado include bristlecone pines that can grow at elevations up to 11,800 feet and thrive in harsh conditions. Limber pines, lodgepole pines, subalpine firs, aspens and blue spruce also grow at or near the timberline.