We all know what tree line is in Colorado: the point above which trees don’t grow. But what determines tree line: Cold? Soil conditions? Precipitation? And is tree line different in various parts of ...

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 ...

Scientists say the frozen remnants of an ancient forest discovered 600 feet above the modern tree line on the Beartooth Plateau may portend possible changes for the alpine ecosystem if the climate ...

An error has occurred. Please try again. With a Centralmaine.com subscription, you can gift 5 articles each month. It looks like you do not have any active ...

High above the tree line, where snow can linger well into summer and temperatures shift quickly between day and night, the ...