Welcome...
Joined the group last year hoping for the same. Never got much traction here in the JK forums. There is a Nor-Cal specific trail thread on the sister TJ forum.
NorCal Jeep Adventures
Its been a bit slow due to sheer amount of snow/weather.
Being on spring break next week I was hoping to head up to the snow midweek but haven't seen a group able to do so. Keep me in mind if you start putting something together yourself, I'll do the same.
Cheers