They are open all year and $50.00 a night and yes they have air and heat Microwave and small fridg fire pit. Public shower and bath rooms only steps form cabins. Children play area, and tackle /fly shop. This is not going to be the catch all fly shop but they will have a selection of the best flies & baits to catch the Spring River trout, soda, ice, snacks, here is their FB page
http://facebook.com/mammothspringcampground