I have a couple of hides up in Truckee that are accessible during the winter.
There is this one in old downtown (as long as there wasn't just a giant dump of fresh snow, this will be accessible as it's right next to the road.)
http://coord.info/GC1N6N8
And then this one in the newer downtown. Again, as long as there wasn't a giant dump of snow this should be easily accessible. It is sheltered.
http://coord.info/GC1N6M6
I also recommend these two in the Tahoe City area, both should be accessible during the winter.
http://coord.info/GC12FKF (this one is is a must grab!)
http://coord.info/GC1KJCK
We have a few more hides in the Truckee area, but they are definitely summer/fall time caches. There's been so much snowfall this year it seems like just about every cache has been buried! Good luck, and happy caching!
-Lindsay