Rocky Mountain National Park sits at the heart of Colorado's high country, where summer arrives late and departs early. In ...

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. But as temperatures continue to warm, ...

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 environments ...