The Salt Lake Track Club has a winter running series, but I think it only goes to a 15k. I just checked their web site and there's no mention of '09 yet, but I'm sure they'll be doing it.
http://www.slctrackclub.org/
The first 1/2 that I know of is part of Strider's Winter Training Series. I've run it 3 years in a row and enjoyed it. The route is the first 1/2 of the Ogden Marathon course.
http://go.ebizwebpages.com/striders/...racing_circuit