Adventure Projects is hiring an Android engineer to join us in Boulder, CO
Mountain Project Logo

Routes in Hidden Boulder


Ironically, the Hidden Boulder is one of the biggest of the Hillcrest boulders, but that doesn't prevent it from being hidden as you approach it. But once you get there you'll find numerous problems with a few of them being extremely highball. The (downhill) side of the rock is where you'll find the highball stuff on vertical faces, and the steeper stuff is uphill from that and much shorter.

Getting There

From the Saddle Boulders, take the well-maintained trail above them up hill to the right. The trail ascends a steep slope then turns slightly to the left going to the top of the hill. Stay on this trail until you see the hidden boulder on your right about 50 feet off the trail. You can't miss it.

6 Total Climbs

Route Finder - Best Climbs for YOU!

Location: Hidden Boulder Change
Type:  to 
Sort by:   then:

Classic Climbing Routes at Hidden Boulder

Mountain Project's determination of the classic, most popular, highest rated climbing routes in this area.
More Classic Climbs in Hidden Boulder »

Weather Averages

Days w Precip
Prime Climbing Season


santa rosa, cali
drunkenmaster   santa rosa, cali
your f.a. info is wrong again guys - maybe you should just leave the f.a. info out if you're not sure rather than ASSuming! here's the correct info before i forget:

- "gimme my forty sucka" was put up by my friend sean brady around the same time we developed the "cow boulder" and i did the problem "space lord" (V1) on "the mother".

-"natural disaster" was put up by mr. rough the same day i did f.a. of "brass monkey" (V2) on the same boulder.

Nov 6, 2004
Brian Quiter
Oakland, CA
Brian Quiter   Oakland, CA
really, i just guessed the first ascent info to get your attention (note the question marks)... it worked! thanks! Nov 7, 2004
santa rosa, cali
drunkenmaster   santa rosa, cali
next time save everybody the trouble and just..hmmm?..ask! Nov 8, 2004
I just started coming out here and am kinda new to the area, can somebody give more clear instructions on how to get to this boulder? Thanks! Aug 26, 2012
VV Pkwy & Browns Vally Pkwy, go west on VV Pkwy. Two ways to get there from here:

#1: 2nd street (Hillcrest) go right. Go straight through a slight left bend. At end is a sharp 90 deg left turn. In front of you will be a small draw with 2 large trees and a boulder (lots of good problems). OK here is where it will get a little confusing. Directly across the stream bed from the boulder is a access gate. Go in here and turn left and start following the trail up hill. This will weave between many boulders with a lot of problems. Keep going till you cross back over the small creek bed and get past the initial cluster of boulders. You will start up a long straight trail pointed straight towards 2 big boulders (Saddle Boulders). More awesome problems! Go around to the right and at the ridge trail (large) go right. Go up the steep hill and at the top turn left to stay on the ridge. About 50 yards look right in the meadow. That's the Hidden Boulder aka Sean's Boulder.

#2: Park by Boxcar Woody boulders. Go through access gate to get behind the BW Boulders then follow the steep trail straight up to the ridge. You come out right by the Saddle Boulders. Turn left on the ridge trail. Up the steep hill. Left at top. Look right after 50 yards. That's the Hidden Boulder. Aug 27, 2012
Thanks for the beta, Rough! Finally got the chance to go look for it and sure enough found it! One more question, on the Saddle Boulders, is there a name for that crack? Sep 12, 2012
Salamanizer suchoski
Vacaville Ca.
Salamanizer suchoski   Vacaville Ca.  
It's just called the Y crack. I think more people refer to it more as the Why crack though. I like it. It's easy but you get a little offwidth, a couple fist and hand jams. Be a bit jagged if you OW skills suck. You can climb the face moves and avoid any crack climbing all together. Pretty much V0 either way I think. Sep 21, 2012
Sweet, thanks, just wondering because it wasn't listed as a problem, although it is a fun one! Sep 22, 2012
lowball, scrunchy problems on the short left side overhang. kinda fun when you're too sketched to climb the highballs. :) Jan 28, 2013

More About Hidden Boulder

What's New
Guidebooks (7)

All Photos Within Hidden Boulder (8)

Most Popular · Newest · Random