Montana can be fun in the winter if it is not too cold. I lived in Bozeman for four years while faking my way through Kolledge

Sometimes it is downright worthles to even attempt fishing in the winter. The answer to your question is fairly obvious, spring creeks and tail waters. The pay to play spring creeks near livingston can be fun and you can fish them for less money than you would in the summer. My favorite winter time fishery was the Madison below bear trap canyon. If it is below 25 degrees I would not even bother. Stripping buggers, and muddlers almost exclusively. I landed some huge browns during the winter. I would alway head out there when the temps got above the absolute frigid mark. I would usually tote a shotgun and kill a couple mallards, geese or hungarian partridge too. The spring creeks can be alot of fun if the temps get above freezing. There can be some little midges that come off and make the creeks come alive. Have fun and report back.