BLM-Alaska manages four public shelter cabins - the Tripod Flats, Old Woman, Bear Creek and Rohn - along the Iditarod National Historic Trail. One of the most famous shelter cabins—the Rohn Cabin—was originally built in 1939 for pilots stranded on the north side of the infamous Rainy Pass. In 1999, the federal Bureau of Land Management  (manages the area) restored the cabin with a new roof and floor.

The BLM built and maintains the shelter cabins primarily used by winter travelers. The Tripod Flats and Old Woman shelter cabins are found on the heavily traveled Kaltag Portage between Unalakleet and Kaltag. The Tripod Flats cabin is 35 miles from Kaltag and the Old Woman shelter cabin is 15 miles further on the trail.  The Bear Creek and Rohn shelter cabins are  between Nikolai and Rohn in the remote Farewell Burn.

Except for the Rohn cabin,  all shelter cabins are accessible only during the winter. Use of these cabins is free, and no reservations are required. Due to the potential for extreme weather conditions, users are expected to share the cabin with others if necessary. Each cabin is equipped with bunks, a woodstove, and outhouses.

Here is a map of the trail and cabin locations.