Flatirons: Green Mountain

 The sandstone in the Flatirons is of the Fountain formation, just like Eldorado Springs Canyon to the south. The climbing is both varied and unique, offering holds that range from bathtub sized huecos to crozzly crimpers to snot-slick pebbles. As a general rule, the darker the rock the better the quality, as the lighter red and whitish bands of sandstone tend to be very unconsolidated and friable.

Flatirons: Bear Mountain

 The main drawback to Flatirons bouldering is the distance between areas. Unlike Hueco Tanks, or even Flagstaff Mountain, where you can visit many of the rocks in a day, Flatirons boulders pop up in either distinct but distant clumps, isolated blocks or bedded ridges. The highest concentrations of bouldering can be found at the Ghetto, the Satellite Boulders, the Terrain Boulders, and in Fern Canyon.