I loved that Colorado Daily wrote this article about some of the best places to hike in the winter. So much so that I wanted to spread their message (I hope they don't mind)!
I'll add, that along with the famous Sanitas trail off of Mapleton (which we love as a family!), one of our favorite areas is around and in between the Eagle Trail and Boulder Rez areas (close to Haystack Mountain)... the Eagle/Sage/Lefthand Trails - more of that below the Colorado Daily article.