The US Fish and Wildlife service has a web page listing national wildlife refuge ski trails across the US - but most are MN/WI! I wonder if some of the mixed-use trails might informally allow skijoring (emphases mine) ...
... Some refuges loan out ski equipment free or rent it at low cost...
Seney National Wildlife Refuge, MI Ski through a mature stand of sugar maple, beech and yellow birch trees. Admire hardwood forests, marshes and the frozen Manistique River.
Trails: The Northern Hardwoods Cross Country Ski Area includes more than 9 miles of trails groomed for classic cross-country skiing. Trails are rated “easiest” to “most difficult.” Trails usually are groomed weekly. Get a map here.
Rydell National Wildlife Refuge, MN Ski a rolling terrain along savannah, wetlands and maple basswood forest.
Trails: 7 miles of wide groomed trails, shared by skiers, hikers and snowshoers. A trail guide is available at the refuge.
Minnesota Valley National Wildlife Refuge, MN Use an extensive ski trail network in the Minnesota River flood plain to explore parts of the refuge that are inaccessible most of the year. Flat trails lead past forest, prairie and marsh. Borrow snowshoes free with an ID at the Rapids Lake and Bloomington visitor centers.
Trails: About 100 miles of trails include refuge trails that link with those on adjacent state and municipal land. Refuge trails are ungroomed. Some state trails are groomed.
Trempeleau National Wildlife Refuge, WI Ski along wooded edges of prairies and wetlands. Some backcountry trails are shared by hikers. The refuge offers some guided snowshoe tours and cross-country ski tours. See the website for schedule. Snowshoes are available free for use on site.
Trails: Ungroomed trails cover about 4 miles. Pick up a trail guide at the refuge or download it from the website.
Tamarac National Wildlife Refuge, MN Ski along scenic lakes through Northern woodlands
Trails: About 8 miles of occasionally groomed trails. The Pine Lake Ski Trail consists of two loops: a relatively flat 2.2 mile loop and a hillier and more challenging 5.7 mile loop. Call for date of last grooming. Pick up a trail map at the refuge visitor center or information kiosk.