Overview
The eastern toe of Colorado's Front Range is in most places guarded from the Great Plains by a series of craggy ridges. These rocks take on a unique from and flavor in the foothills southwest of Boulder. The wide swath of public land between Boulder and Eldorado Springs holds best climbing the red Fountain Formation has to offer. Climbing options in the Flatirons vary between obscure boulders and slabs scattered through the woods to lofty technical summits and frighteningly exposed towers. Climbing history here dates back over a hundred years and generations of the world’s best climbers have honed their skills on the red sandstone.
There are dozens of named formations and established routes number in the hundreds to the thousands. A significant number of the routes finish on high summits and should not be missed if you enjoy climbing long and moderate routes with exciting finishes. As a rule of thumb, the eastern facing routes are low angle and usually offer the easiest line of ascent. The north, west and south sides tend to be steep to overhanging. Climbers can find anything from long 4th Class scrambles, to 5.14 sport routes, to V10+ bouldering. Certain climbs, the First and Third Flatirons for example, can be very crowded on weekends, but it’s easy to find solitude the multitude of other less visited crags. Noteworthy summits in the Flatirons include, among others, all of the five numbered formations, the Devil’s Thumb, the Maiden, the Matron, Seal Rock and the Amphitheater towers.
This page would get enormous and unwieldy if every quality Flatiron climb were listed. In an attempt to maintain the direction of SummitPost I recommend submittals here be limited exclusively to summit routes. This still is not a short list as many a fun climb exists that meets that qualifier. There are several other good climbing sites out there that offer info on a greater range of climbs ( climbingboulder.com ) and boulder problems (frontrangebouldering.com).
Getting There
Numerous Open Space and Mountain Park trailheads are scattered in the area south and west of Boulder. Consult online maps or look for access details on specific crags in the routes section.
The trail system in the Flatirons is world class. All maintained trails are well marked and most trailheads provide maps and general information.
Red Tape
To my knowledge, all of the land in the Flatirons (other than Eldo State Park) is managed by Boulder Open Space and Mountain Parks. The regulations that govern Open Space and Mountain Parks are lengthy so I won’t go into many details here.
The rules of greatest interest to climbers are probably those that deal with seasonal wildlife closures. A significant portion of the Flatirons closes for half a year to protect habitat. These restrictions came about in the late 80s and have always been a contentious issue. An important issue of late is the creation of the Visitor Master Plan, which threatens off-trail access to many crags and boulders.
Guidelines specific to climbing can be found here.
General Open Space and Mountain Parks info can be read here.
Most trailheads will also provide information on general rules and closures.
When To Climb
Much of the climbing in the area can be comfortably done 12 months a year. Take into account northern aspects when planning a route since these faces can hold snow and ice all winter and can turn a relatively easy route into a full alpine experience. The lower-angle east faces can range from sunny and dry slabs to mixed ice adventures so use your best judgment with weather and climbing conditions.
Also remember to check on seasonal wildlife closures since many of the prominent summits aren’t open for half the year.
Camping
Camping in the Boulder area is tough to impossible. Your best bets are Golden Gate Canyon State Park and the Arapaho National Forest.
Mountain Conditions
Flatirons Webcam
External LinksImages
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Boulder Group
