Seal Rock is one of the most visible Flatirons from Boulder with its distinctive yellow and orange north face. High on the south side of Bear Canyon, this rock offers sporty trad climbing and potential for bold new routes on the radically overhanging south face. There is one sport route, the three pitch Sea of Joy on the north face, and a good 5.4 slab route climbs the east face before rappelling off the summit.
Getting There
Follow the Mesa Trail south from NCAR, passing the two sharp switchbacks that enclose the Bongo Boulder en route to the top of Radio Tower hill. Fifty yards past the turn-off for the Bear Canyon Trail, which heads west into the canyon, notice a small trail cutting up and right (west) into the trees. This unsigned trail is the Harmon Cave Trail, which takes you past the gated-up Harmon Cave and switchbacks up a steep hill to the south en route to the base of Seal Rock. Stay left for the south face routes or go right to reach Archaeopteryx and Sea of Joy on the north face.
Getting Off
Addendum: There are at least 3 ways to get off this crag from the summit. 1) You can downclimb Shortcut, 5.4. 2) You can do a 50m rappel Sea of Joy's anchor bolts (40 ft E of the summit) on the N face. Note, the rope can get stuck on the pull. 3) Supposedly, you can downclimb 40 ft to the W, then go down a ramp to the SE, and then rap 135 ft from an eyebolt.
The Classics
Mountain Project's determination of some of the classic, most popular, highest rated routes for Seal Rock:
Another amazing route on my new favorite Flatiron.Begin just around to the right from the steep south face of Seal Rock. A small flatironette called the Pup leans up against Seal Rock here, and they are separated by a wide crack. Climb this crack for 30 feet or so, then cut left and head up the East Face, aiming for an obvious tree. This pitch is the crux of the route. There is a mossy shallow water trough below the tree - I climbed to the ri...[more]Browse More Classics in CO
Some clarification on the approach: as you walk south from the Bear Canyon turnoff it is easy to overlook the Harmon Cave trail. If you reach the Fern Canyon turnoff (also to the right as you head south), then you've gone too far.
Some further info on the primary, 165' rappel from this rock: check out Rossiter's topo to find it. Some of the route descriptions here that describe how to get to the rappel can be deceiving; it is actually below the false summit with all the marine life on it, right on the very north edge of the east face. If you go all the way to the true summit you will have to downclimb and return to the rap station.
Regarding the descent: The rap anchors are 30 feet down and climber's right of the true summit. One can either climb the entire face and downclimb to the anchors, rap from the anchors as you get to them, or downclimb the obvious gully system to the ledge where you can locate the walk off at the north edge of the east face. I advise climbing with two ropes, going to the summit, and downclimbing to the rap anchors. We downclimbed a section of rock on our way to the walk off ledge (not advised) which turned our outing into 5.7X and added an additional 300 feet of 'climbing' - quite the adventure.
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