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Lost Flatiron

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Arete T,TR 
North Face Left T 
North Face Right T 

Lost Flatiron Rock Climbing 

Photos:  Recent | Best | Popular
Elevation: 6,900'
Location: 40.0009, -105.3929 View Map  Incorrect?
Page Views: 4,840
Administrators: Leo Paik, John McNamee, Frances Fierst, Monty, Monomaniac, Kristine Hoffman (sitewide)
Submitted By: Michael Komarnitsky on Jan 1, 2001
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BETA PHOTO: Map of BC from Cob Rock to Boulder Falls.

Seasonal Closure MORE INFO >>>


As far as climbing is concerned, this one should stay lost! Rossiter's guide book calls it a 5.7 and two to three pitches. This is a single pitch (60m rope) 5.4 at best, mostly 5.2-3. The downclimb through the gully was more exciting! Granted, it's a beautiful slab of granite, seemingly lost in the Canyon, but does not come as advertised. I'm never one to feel badly about a climb, it beats damn near anything else, but this one bordered on a waste. The so called "crux" is one step around a tiny tree towards the top. Enjoy the many other wonderful climbs in the canyon!

There is a crag between Lost Flatiron and Witches Tower with at least 1 route on it, a 5.8 or 5.9 trad obscure line.


A. Arete, 10+ X, 1p, 160', gear?
B. Ramp?, 8 to 9+, gear.
C. North Face Left, 7, 2p, gear.
D. North Face Right, 6, 1-2p, 210', gear.

Getting There 

Drive 6.6 miles up Boulder Canyon, and park at the large pullout on the south side of the road underneath Cob Rock. It is visible from the parking lot. Cross the stream (easiest is at the east end of the pullout), and then hike about 300 yards up and right from the trail on the west side of Cob Rock. Exit from the top is via a steep gully on the west side.

Climbing Season

For the Boulder Canyon area.

Weather station 4.2 miles from here

3 Total Climbing Routes

['4 Stars',0],['3 Stars',1],['2 Stars',1],['1 Star',1],['Bomb',0]

Featured Route For Lost Flatiron
Rock Climbing Photo:

North Face Left 5.7 5a 15 V+ 13 MVS 4b  Colorado : Boulder Canyon : Lost Flatiron
2 pitches. Start 6 feet from left edge (ramp) of the flatiron's face....head straight up beautiful slab with decent cracks here and there for pro. There is a nice wide crack for fun about halfway up. Can belay at any of numerous ledges after half way or more. Crux is going around the LEFT side of a small tree (right on edge, much exposure) 50 feet from the top. Continue on steep slab to summit. It's not climbed often so a nice moderate isolated route. ...[more]   Browse More Classics in Colorado

Photos of Lost Flatiron Slideshow Add Photo
Rock Climbing Photo:
Rock Climbing Photo: The Lost Flatiron as seen from the Blob Rock appro...
The Lost Flatiron as seen from the Blob Rock appro...

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By Anonymous Coward
Apr 21, 2002
HHMMM... Do you think this is classic Rossiter- Blowing his own horn? 5.7? eh O.K.
By Anonymous Coward
Sep 21, 2003
I regret not having read climbingboulder's description of this area before bushwhacking my way a couple hundred yards up a 45 degree slope for an uneventful 5.4 climb. The only interesting aspects of this climb were the runouts and an excellent view of Cob Rock.