The bubble has some really large hueco-like surfaces, some overhanging, some vertical, and some easier slab climbs on the left side. All the climbs on the rock are bolted for sport climbing, though some could certainly be lead trad. The rock is rather rough on the hands, though frictiony jugs and lips lead to some rather interesting climbing.
Routes on the below picture are as follows:1) Face 2) Solar Power (not shown)3) Left Edge4) The Ladder (the old toprope 5.9 is just right of this climb)5) Bubble Boy (5.10c var)6) Bubble Boy7) On the Road (toprope)8) Catchy9) Right Climb
Getting There
Head uphill on the fire road, traveling up to the 180 degree bend. You can't miss it. If you did, let us know, we'd like to laugh at you. Approach time: from the parking lot 15 - 30 minutes. From the monument, about 10 minutes.
The Classics
Mountain Project's determination of some of the classic, most popular, highest rated routes for Bubble, The:
A word on the Bubble, if I may... This is the original climbing area on the mountain and was traditionally a top rope cliff. I know of people climbing here as early as the early '70s, but am sure it was climbed even earlier.
A point of interest is that in 1979, a student was quietly enrolled in a beginning rock climbing class at Pacific Union College, just down the valley in Angwin. Jim Hanson, the instructor (RIP), told me this guy had an uncanny ability with knots and knowledge of gear in the classroom. Half way through the semester they went on a field trip to the Bubble and this kid just hiked all the climbs on the cliff. Jim pulled him aside and said "You've climbed before, haven't you?" The hilarious part is that young Tony Yaniro had just freed The Grand Illusion, .13c at Sugarloaf. At the time it was the hardest route in the world! Go figure. He needed elective PE credits and was enrolled at PUC from '79-'81, or so.
In the '80s, somebody bolted the prominent arete to the left of the Bubble Ladder. Being a historical top rope crag, some local chopped the bolts and the crag remained a popular top rope area until around 2000 when local climber Jordy Morgan stepped up to the plate and went off with his Hilti, establishing a bunch of "new" routes, but not really "FA's" The guide books are still pretty confused about some of the new lines and grades. So be wary and have fun. Chris Summit's "Wine Country Rocks" is likely the most accurate printed topo.
Marc Jensen, in his "Bouldering Buildering and Climbing in the San Francisco Bay Region" (3rd edition, 1988) said: "The Rock...is a volcanic conglomerate with a hard surface layer that allows climbing. If this outer layer is missing, the rock is as strong as cottage cheese." Either he was just wrong, the cheese has hardened, or he was trying to keep the crowds away. In reality, the rock isn't that bad, but it isn't Yosemite either.
Elevation: 2956', GPS: N38.39.055 W122.36.797 (You won't need it though..)
Due to the nature of the volcanic rock, temperature can really affect the friction. Basically if it's cooler then it's really fun, if not then it's really slippery.