Re: Your favorite winter fly
A #10 olive wooley bugger has served me well during the winter. I've been able to catch trout on freezing days using that pattern, so that's where I start. Green Weenies and Zebra midges also work, but are usually tied as a dropper off the back of a wooley bugger. I've been tying my buggers with green or black beadchain eyes for the past few year, and do much better with those than buggers without anything or a single bead.