I'm planning on attempting Granite Peak this winter (December). I know that Granite has a reputation of being notoriously hard to climb in the winter, and all the trip reports I have read seem to echo that sentiment, to the extent that I have not yet found a trip report with a successful summit. McCarty and Leo did the North Face back in December of '71 and I'm sure that many parties have successfully done it since, but per Montana code, no one talks about it.
In preparation for the trip I am hoping to find someone, or just read a trip report of someone who has summited in winter. Anyone willing to share, or know anyone who has done it?
It really seems like the crux of the whole thing is the weather. Are successful parties lucking out with huge once-every-few-years weather windows, or committing to fast and light missions to maximize short windows?