Known as the Flatirons, the enormous rock formations jutting up from the Rocky Front Range south of Boulder provide some of the best short technical climbs near Denver—and you won’t even need gear. The softer sandstone rock makes for challenging, but doable, bouldering ascents with holds varying from open ledges to tiny crevices and deep fissures. The slanted slabs at Flagstaff in Boulder Mountain Park are best for beginner and intermediate climbers. These can be reached via dozens of access points from the network of hiking trails. Hint for holds: the darker rock is strongest. Getting There: Follow 36 North to Boulder and exit at Baseline heading west into Boulder Mountain Park.
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