I lived in the Northern panhandle for a few years and were at an elevation of ~3000ft. We had about 3 feet of snow on the ground throughout the winter. However, if I drove about 15 minutes to town, where the elevation was about 2000 ft. the snow would come and go throughout the winter. It is fairly temperate there due to the close proximity to the coast.
It’s sounding interesting — and skiing in Sun Valley... nice!