Flatirons Climbing Closures

Updated January 31, 2013

The following areas are closed every year from Feb. 1 – July 31 to protect cliff-nesting raptors. Thanks to OSMP visitors and volunteers for supporting these closures and the cliff-nesting raptor program!

Feel free to contact City of Boulder Open Space & Mountain Parks by phone: 303-441-3440 or 303.441.4060 ext 420 & x 416.

Flatirons Area Closure Overview

Mt. Sanitas Ridge (PDF Map): 1st Buttress Only. Re-opened 5/15/13

Gregory Canyon Amphitheater - Parts of Gregory Canyon Amphitheatre are closed to protect nesting owls. The closed routes are East Bench Dihedral, SE Arête (also sometimes called SE FACE), and the Juniper Crack. A voluntary closure is in effect for other routes in the Amphitheatre to provide additional protection for the nesting owls. Closure map

The entire Third Flatiron (PDF Map): all routes, including: The Descent Trail, Queen Anne’s Head, W.C. Field’s Pinnacle, 1911 Gully, The Ghetto, The East and West Ironing Boards, The Fin, Green Thumb, and Jaws are closed.

Back Porch and The Box (PDF Map)

Skunk Canyon and Sacred Cliffs (PDF Map): The Skunk Canyon Drainage west of the Mesa Trail, including: Ridge Two, Ridge Three, Ridge Four, The Achean Pronouncement, the Dreadnaught, and the South Ridge of the Green Mountain known as the Sacred Cliffs.

North side of Fern Canyon (PDF Map): (Fern Canyon Trail is open) East Ridge, Nebel Horn Ridge, The Goose, and Goose Eggs are closed.

Bear Creek Spire (PDF Map)

Shadow Canyon (PDF Map): The entire Devil’s Thumb Ridge, Towers of the Moon and Jamcrack Spire are closed. The Maiden is OPEN to climbing with access from the EAST side only.

Mickey Maus Wall (PDF Map): All routes are closed.

The East Face Der Zerkle is closed from April 1 until September 1, 2011 to protect roosting bats.

Diamond Head and SoBo Buttress: west of Shadow Canyon, accessible from South Mesa Trailhead (South Boulder Peak Trail will remain open)

Flagstaff North: The north side of the Flagstaff Mountain Summit.

Lefthand Canyon Palisades.- Re-opened 5/14/13

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