Its not so much about the month as it is the day unfortunately. You could show up during the snowiest month we have ever had but if you are hitting a resort day and it hasn't snowed in 2 days you might be fucked. I would say jan-feb for the clear creek/summit county resorts, and a little later like early to late march for southwest CO for the later months.... Good luck cause you never know. My best powder days have all been a crapshoot and were never planned on. When I plan on something it never seems to be what I hope. Overall January to the end of March would be your best bet.
When the fuck did we get ice cream?