Sasse Mountain Trail (#1340) is a 5.5 mile out and back trail located near Roslyn, WA that features a lake and is rated as difficult. The trail is primarily used for hiking, horses, and mountain biking and is accessible from May until October. Dogs and horses are also able to use this trail.
Take I-90 Exit 80. Head north following Bullfrog Road to SR 903. Follow 903 for 10 miles through Roslyn and along Cle Elum Lake to FR 4305 (about 1/4 mile before the Wish-poosh Campground). Turn right into FR 4305 and follow for a half-mile to the first intersection. Veer left and continue on FR 4305 for another mile, watching for a sign pointing left to Sasse Mountain. From here it is another mile to the end of the road and the trailhead.