We had a visit from the Mongolians in Elko one year for poetry. They call a yurt a ger and had a traditional one set up for our inspection. It is a great winter shelter. Large canvas tents with wood frames, doors and a wooden floor are also very satisfactory and have been used for hundreds of years in North America. Do not discount a Plains style tipi with a winter liner either. Other native shelters like longhouses, wikiups, and earth lodges work fine. If I was in North Dakota, I would go with the earth lodge like the ones the Mandans used to house Lewis and Clark for the winter on the Missouri.