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Routes in Rock One

Rock One Route T 5.4 4a 12 IV 10 VD 3c
Type: Trad, 320 ft, 3 pitches
FA: unknown
Page Views: 2,612 total, 16/month
Shared By: Leo Paik on Aug 28, 2004
Admins: Leo Paik, John McNamee, Frances Fierst, Monty, Monomaniac

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15 Opinions

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Season raptor closures Details


This is a pleasant romp up good rock at an easy grade. This route will wander up the lower-angled, left side of the SSW face/prow of Rock One. It connects nice features & can have plenty of variations at a similar grade. It has enough features and short-enough traverses to allow a shorter (6-8 year old) climber to ascend without excessive difficulty.

Note, this crag is often closed during raptor closures until July 31. Check the closures before heading here.

To find the start of the route, locate the nadir of the rock. There are 2 distinctive features that help locate the easiest start. Find a jutting prow of rock with a steep, left-facing dihedral. The start is just to the left by about 15' on a slab. Or, find a large, dead tree leaning against the lower left side of the face. The easiest start lies to the right by about 60'. Some brushy scrambling may be required to reach the start.

This route can be done in 2-5 pitches depending upon your desire & your rope length. Longer pitches will decrease your ability to communicate precisely with your partner(s). The exact line can vary immensely, but here is a line keeping with the grade on good rock:

P1. Ascend a slab angling left toward a tree (about 30 feet up), and pass the tree on the left to gain a ledge (optional belay). Here go left to the left of two cracks & ascend. Angle right up an angling crack across a slab. Climb a chimney next to a large, dead tree leaning against the rock to a notch & belay. Sling the horn and back it up with a large cam, 5.4, 160'.

P2. Follow a crack just right of a blunt arete to a step right (a reach for the young) & ascend a slab to a roof. Skirt the roof going left (optional belay). Climb a short left -facing dihedral, a short slab, & belay on a slightly-sloping ledge, 5.4, 170'.

P3. Move right into a nearly-horizontal groove to a short slab with a right-angling crack above. Ascend this to 4th class terrain & the summit, 5.4, 100'.

Descent: scramble NNE (just right of the highest line) to walking terrain between Rock One & Twin Owls. If you didn't leave gear at the base, it may be easiest to hike up & behind Twin Owls and take the trail down the East side of Twin Owls.

Addendum: those who like a well-worn path rather than a bit of adventure will not likely appreciate this route.


A light rack of wires & cams.


Boulder, CO
  5.4 PG13
kswissto   Boulder, CO
  5.4 PG13
Wishing that I read the above comments before doing this route. So many better routes nearby. Approach is overgrown as is descent. Bring your routefinding glasses. If you're looking for the true 5.4 grade, expect runout sections. I opted for a few harder variations due to pro placement (for me and my second).

The "chimney" mentioned really didn't feel like a chimney. Beware as there are other real chimneys nearby that go at a harder grade.

The crack pitch was fun, but I don't think this route is worth doing again. Aug 22, 2016
Edgewater, CO
Ryan-T   Edgewater, CO
I figured this would be a nice multi-pitch route to swing leads with my girlfriend since she wants to practice leading trad. The approach wasn't bad, we found the base of the climb with ease. The route itself just wasn't that fun. Good things: excellent views, it was nice to work on route finding on an easy grade, lots of places to stop and make belays to decrease rope drag and increase communication, you will definitely have it to yourself. Bad things: lots of vegetation, all of about 2 20 foot sections where there was interesting climbing. In all, not the worst climb I have ever done, but there are classics nearby, that are probably a little more worth the drive and approach. Sep 28, 2015
Lee Smith  
This is a terrific romp and a great moderate adventure climb. It is reminiscent of what is was like to climb at Lumpy in the seventies before it got popular. We did it in 5 short pitches to facilitate communication and reduce rope drag. Amazing fun! Aug 16, 2014
Derek W  
There is a good horn to sling to bail from at the top of the first pitch. There is currently a red sling with a rap ring in good condition we used to bail in the rain last weekend. Aug 31, 2009
Julius Beres
Boulder, CO
Julius Beres   Boulder, CO
I did this route after seeing it listed on Neptune's "favorites." I figured it would be an easy romp to go on with a friend, but that it would be pretty fun if it made the favorites list....

Normally I don't like to trash a route, but this is by far the worst route I have ever been on at Lumpy, and quite possibly in Colorado. The approach is annoying... the faint use trail is overgrown and hard to follow. Now I don't mind taking a bad trail when doing some alpine stuff, but to get directly above McGregor Ranch on a poor quality route it is not worth it (especially considering all of the nice trails that go to fantastic climbing almost everywhere you look at Lumpy).

As for the route... I split what is described as the first pitch here into two and combined the last two pitches in one for a total of three pitches. The fallen dead tree in front of the chimney makes it a hassle to deal with rope drag, so I just set up a belay at its base and again at the top... from there I basically followed the description and went up easy ground to the top (I'm pretty sure I was close to the route... saw an old piton up there...).

The chimney is very lush and full of ferns. The climbing isn't particularly interesting and all of the vegetation is annoying (the rock itself is high friction and generally solid, although mostly covered in lichen).

I would recommend that if you are looking for a very easy route in Lumpy that you do Batman and Robin on Batman Pinnacle instead. It is comparable in length and almost the same difficulty but much cleaner and more interesting climbing with a cool pinnacle summit.

Finally, for those that still want to do this route, here is some more beta on finding the start. We walked right by it in the morning, since there are dead trees everywhere, and when approaching from the east, the profile of the rock looks very different than the picture taken from the west.

When you get to just below the base, you will see a dead tree "stump". It isn't really just a stump but a huge trunk of a dead tree that apparently broke off a while ago. It is the most unmistakable thing around there and the start of the route is just above. The "trail" sort of takes you right below that dead stump and there is a cairn below. Scramble up about 30 feet of class 3/4 rock or go up easier terrain to the left and cut back right. The rest of the route is pretty straightforward.

This climb is more like bushwhacking than climbing. Expect to step over numerous dead trees on the approach and either be very careful or get scratched up... the walk off is easy and not exposed, but once again you are stepping over rotting trees trying to not get too scratched up.... Jul 22, 2009