THE FLATIRONS

(CITY OF BOULDER OPEN SPACE AND MOUNTAIN PARKS)

SEASONAL CLOSURES IN THE FLATIRONS

OSMP CLOSURES PAGE + OSMP INTERACTIVE CLOSURES MAP

SEASONAL CLOSURES FOR GOLDEN EAGLES (DEC 15th - JULY 31st)

  • Lefthand Canyon Palisades: at the intersection of Lefthand Canyon Drive and Olde Stage Road (Buckingham Picnic area remains open) (CLOSED)

  • Flagstaff Mountain: the north side of Flagstaff Mountain will be closed (the Boy Scout Trail and Flagstaff Summit will remain open)  (OPEN as of 5/15/26)

  • Skunk Canyon: including Ridges 2, 3, and 4, the Achean Pronouncement, the Hippo Head, the Dreadnaught, the North Ridge, and the entirety of Sacred Cliffs  (OPEN as of 5/15/26)

SEASONAL CLOSURES FOR PEREGRINE FALCONS (FEB 1st - JULY 31st)

  • Third Flatiron: including the Queen Anne’s Head, W.C Fields Pinnacle, 1911 Gully and the Ghetto, the East Bench & West Bench, the East & West Ironing Boards, The Fin, Green Thumb, and Jaws (CLOSED)

  • The Back Porch (CLOSED)

  • The Box (CLOSED)

  • Fern Canyon: north of the Fern Canyon Trail, including the Nebel Horn Ridge, East Ridge, the Goose and the Goose Eggs (the designated Fern Canyon hiking trail will remain open)  (CLOSED)

  • Shadow Canyon and the Matron (the Maiden will remain open and accessible from the east; Shadow Canyon Trail will remain open)  (CLOSED)

  • Devil’s Wings South  (CLOSED)

  • The entire Mickey Mouse wall: including South Tower, North Tower, Central Tower, Ship’s Prow, Wall of Shiva’s Dance, The Gargoyle, the East Face, and Cryptic Crag  (CLOSED)

  • The Morning After (OPEN) (Formerly included in the Third Flatiron closure)

  • Der Freischutz: including Frankenstein’s Castle, The Bubble, and both Southern and Northern Dinosaur Egg (OPEN)

  • The Apostle (OPEN)

  • The Sphinx (OPEN as of 5/15/26)

  • Devil’s Wings North (OPEN)

    SEASONAL CLOSURES FOR BATS (BEGIN APRIL 1st)

  • East face of Der Zerkle: April 1st - September 1st  (CLOSED)

  • Mallory Cave area: East face of The Hand, standard route on Finger Flatiron, and all of Shark’s Fin are closed April 1st - October 1st for bat roosting (CLOSED)