There is a fairly active music scene in Fort Collins. I've been impressed by what I find there. Fort Collins Traditional Music would be a good start.
http://www.meetup.com/Fort-Collins-Traditional-Music/members/

KUNC is a community NPR station that promotes a wide varienty of music all along the Front Range. Follow the playlists by my friend, Wendy Wham. She focuses on folk music in her radio shows and is well connected to folk music in the area.
http://www.kunc.org/

Then of course there is Swallow Hill Music in Denver. They host acts from around the country and promote the music in the area.
http://swallowhillmusic.org/

Finally, I feel the center of folk music in Northern Colorado is Avogadro's Number in Fort Collins. If you hang out there, you will be in touch and in tune. It is a worthy place to get to know.
http://www.avogadros.com/

If you want more info, send me a note. I am often performing along the Front Range somewhere.

Rex