I haven't been to the Leavenworth area but I'm pretty sure you can ski on the golf course. There are also a lot of sno-parks near Lake Wenatchee, west of Leavenworth on Stevens Pass, that have trails.

http://www.parks.wa.gov/winter/trail...rized&Region=2

I have been to Winthrop in the Methow valley and Eden is right, it has a wonderful trail network.

Kathy