The longer route starts at the Old Rag parking area on the park boundary. Look across the road for the Nicholson Hollow Trail marker, then follow the trail to the cabin and return the same way. NPS lists about 8 miles round trip, seven hours and 1,240 feet of climbing, with several stream crossings. Another route account measures 8.4 miles, so allow a full day and expect a little variation in the distance. Most of the climb comes in the last stretch.
A shorter option uses the Corbin Cabin Cutoff from Skyline Drive: about 1.5 miles each way, but steep. If Skyline Drive is closed, PATC lists that hike-in as four miles. Check the road before counting on the short approach. The Old Rag route requires the park entrance fee. Pets are allowed on the NPS route on a leash no longer than six feet, and PATC lists the cabin as pet-friendly.