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Trees don't grow above the timberline because of high winds, low moisture, and cold temperatures. Trees grow all over the world, in many different types of weather. But above certain elevations, trees just cant grow. Small trees need less moisture and less oxygen.
Also know, why are trees smaller at the top of mountains?
While smaller tree-like shrubs grow above the tree line at much colder spots, trees are limited by their canopy, which shades the ground and makes it colder. "When you get above the tree line the actual local conditions for plant growth are warmer because you don't have the shading effect of the trees."
Likewise, people ask, at what altitude do trees stop growing on mountains?
The tree line in the White Mountains is at 4,500 feet (1,371 meters) while in the Tetons, it's all the way up at 10,000 feet (3,048 meters).
Once the processes that cause the mountains to grow stop, the forces of erosion begin to win, and the mountains are slowly eaten away until there is little left after a hundred million years or so. Also, mountains are large enough that they push the crust of the earth into the earth's mantle forming "roots".