Colorado: 10th Mtn Division Hut Association. Most huts have amenities like saunas, gas cookstoves, and comfortable bunks. Make sure to book pretty far in advance— they tend to fill up quickly.
Maine: Maine Huts and Trails. Three full-service lodges are spaced a day's hike or ski away from eachother. Trails are groomed for easy access, and dinner will be waiting for you when you arrive.
Utah: La Sal Mountains backcountry hut. Guided tours available.
British Columbia: Backcountry Lodges of British Columbia Association. 28 lodges are nestled in the Coast Range, the Cariboo-Chilcotins, the Columbias and the Rockies.