Quick report
Continuous snow coverage is most common above about 11,000' - 11,500' on northerly aspects (NW, N, NE), along with some easterly facing slopes in favored areas above treeline such as the Ruby Range. Of course, there's more coverage in the Northwest Mountains (Ruby Range, Yule Pass, etc) and above treeline compared to near treeline. There is some lingering snow below treeline on northerly aspects, though patchier and likely embedded in vegetation except on isolated slopes. See annotated satellite photos (from CalTopo) for examples.