Hike or ride smooth singletrack on this 7.2-mile lasso-loop, which climbs gently through rich scrubland and ponderosa forest to a killer mountainside overlook.

Cruise 5.2 miles along gentle foothills, Ireland-esque pastures, and past an old sawmill to a vista overlooking Boulder Canyon and the Front Range.

Quiet rules on this mostly off-trail, 5.1-mile scramble up a boulder strewn canyon to a gnarly rocky crown with panoramic mountain views in Pike National Forest.

Hike lonely trails filled with Yosemite-like granite formations in Lost Creek Wilderness on this 15.4-mile out-and-back up the Retirement Range's highest peak.

This 10-mile loop in Hall Ranch begins with a stiff, sometimes technical, climb then speeds into rolling forestland and endless grassy meadows to an old ranch in the shadow of Longs Peak.

Grab your skis or snowshoes to experience this wintry route that climbs past snowy landscapes to Montgomery Pass, a ridge-top lookout in Colorado's Medicine Bow Mountains.

Ride some of western Colorado‰Ûªs finest singletrack with tight turns, long descents, and stunning red sandstone on this 7.4-mile heart-pounder.

Ascend North America's tallest dunes for a day surrounded by alpine peaks, a desert valley, and shifting mountains of sand on this 6.6-mile loop in America's newest national park.

Thanks to only a little elevation gain, this 7-mile loop offers flatlanders great rewards (big views, wildlife, solitude) without much suffering. Pack plenty of water and sunscreen.

Follow this 9.9-mile loop through vibrant wildflower displays and past snow-fed streams to a huge alpine lake with unbeatable campsite views of Mount Meeker.