Alright I just got off the phone with Canyon Lakes Ranger District (970-295-6700) who is over that trail. She said that at the very earliest it will be open is June 15th. I asked if snow pack is a factor in that, she said yes but only if the snow is still there after the open date. She said that June 15th is as soon as it will be open, period more or less is what I got out of it. Its open to foot traffic but the gate wont be open for trucks until then.
I was surprised it was that late because it really isn't that high. Its only at 10,000ft which is high but not like some of the others like Black Bear Pass, Engineer Pass, and Cinnamon Pass. They will be open by Labor Day with the exception of Black Bear since it is a melt off only trail no way to plow it on those switchbacks. But they do plow the others and also the San Juan Public Land Center said its one of the very last in the state to open up. So surprised Storm Drain wouldn't be open at least by the first of June.