This 4.6-mile out-and-back climbs to a group of backcountry lakes tucked below the Continental Divide.

This easy trail passes through rolling grasslands and wetlands to a scenic highpoint overlooking the Front Range. Good for winter rides and cycle-cross training.

Rocky scrambles and a knife-edge ridge lead up one of the most challenging Fourteeners. Stellar views over the untamed Elk Range are endless.

Trek up sparsely-covered slopes and a broad talus ridge in the Sawatch Range to an overlook with endless alpine vistas.

String together three Sawatch summits on this popular circuit with long alpine traverses overlooking the Continental Divide.

It's a scholarly debate on which summit--Mount Columbia or Mount Harvard--is the best. So reserve a long weekend to climb both in the Collegiate Peaks Wilderness, and decide for yourself.

Bag two peaks on this 9-mile, fido-friendly loop around Boulder's signature Flatirons.

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.

Hike into the core of Indian Peaks Wilderness on this 13.6-mile overnight, which leads past waterfalls to a sunbleached valley and a sweet lakeside campsite.

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.