Summer is a great time to venture above treeline into the tundra and the Rocky Mountains are dotted with multitudes of alpine lakes that create ideal destination hikes.

For most of the year, snow covers Colorado’s highest peaks. Above about 11,000 feet, cold blustery winds can be relentless through the winter. But summer can transform these Alpine tundra ...

An ancient fossilized forest in Montana is reemerging 600 feet higher than the present-day tree line after spending the last 5,500 years encased in alpine tundra.