ITS FOR COLORADO.
End of Jan/beg of Feb everyone is between vacations (xMas & spring break), its cold, and usually the most snow.
March has good snow, but it also has like 9 weeks of spring break - heres the math:
4.5 weeks in march + every family + 500 kids from every college in the nation = 2000 weeks of spring break during march.
I'm glad to get input from people that live in the area.
It's a big group and our first trip to Colorado, so avoiding big lines, overcrowding, closed trails and little snow is definitely NOT what we wanted our experience to be.