For those who do not ski or hybernate, I know of a good place to go backpacking in winter.
"Wild and Scenic Area" along Kings River is at low elevation (1600') and never gets snow; the access road is open all year round. The trailhead is 5 full hours of driving from Bay Area, it only makes sense for a 2-nights or longer trip. After a 2-mile hike on a level trail, there are two established campsites and several good spots for "no trace" camping in the wild.
Day hike opportunities include the rest of the trail that goes up the river for another mile then up, wandering / taking pictures in the rocky and really scenic riverbed, or braving steep slopes of the canyon for best views / hidden waterfalls.
Fishing: the river is populated with some really big trout, but the area is under special regulations: barbless hooks, zero bag limit (catch-and-release only). I personally do not find this entertaining; if someone does - rules compliance is your responsibility.
Poison oak: in this area, it is not abundant, but commonly present. In winter, most twigs are leafless and may be hard to recognize. Anyone unfamiliar with this plant or having very high sensitivity are not advised to go.
Posting this trip with open date, mid-December or later. Make a comment to suggest the date(s) that you CAN make. I will be away on a long travel till Dec 2-nd; once back, will tally results and off we go - or wait until more people join.