The Slavonia trailhead provides the closest access the the Mount Zirkel Wilderness and much of the Routt National Forest around the wilderness. Parking and forest information are available at the trailhead. Camping is also nearby; see the Little Agnes page's Camping Section
From Steamboat Springs, CO. Take Routt County Road 129, also known as Elk River Road, north towards the towns of Clark and Hahns Peak. Drive for approximately 17 miles to the town of Clark. (Check out the General Store at Clark, they have maps posted on the blowdown and fires). Just after the town of Clark, turn right onto FR 400, aka Seedhouse Road, at the town of Glen Eden. To reach Slavonia, continue on FR 400 from Glen Eden to the end of the road. There is a trailhead and parking there.