This is a fantastic piece of rock practically right in town that no one else seems to climb on, ever, and I've been going here for years. You can walk to it in 20 minutes from my parents' house. That being said, I find it almost impossible NO ONE has ever been here back in the day. So, if you know the proper problem names or grades, speak up and I will change them.
This is on the Dakota Ridge trail, just north off of the Hawthorn connector trail. You can see it from the overlook at the top of the Sanitas Valley Road.
Mountain Project's determination of some of the classic, most popular, highest rated routes for Hawthorn Block:
Not since the Turd Boulder has Mt. Sandy Ass seen such steep, powerful bouldering. Actually quite a nice handful of problems to do on a sunny, cold winter's day (we were climbing in sweatshirts on a day with a high of 31 degrees).
This is a fun boulder! If I lived in North Boulder, I'd climb here a bunch.... Besides the listed problems, there are tons of possible variations. There are so many interesting holds you could do most of the problems a few different ways (the easiest possible ways were hard enough for me). A nice easy right to left lip traverse is a good V0 warm-up. I'm surprised this boulder hasn't seen more attention. It's sunny, scenic, and close to town with flat landings and mostly solid rock.