Nectarines have not done well in the Uintah Basin. There are a few people who have had success when placing their nectarine tree in a protected/sheltered area. They are somewhat self-pollinating, but usually perform better with a pollinator near by. There are a few secrets that seem to help improve your chances of growing nectarines.
1. Many times nectarine trees die over the winter. This is because of the heating and cooling that takes place in the winter (winter sun-burn). To avoid winter sun-burn on nectarine trees, it is best to plant nectarine trees on the North side of a building or a location where they do not receive a lot of southwest sunlight in the winter, but also where they will receive adequate sunlight (5 or more hours) in the summer.
2. Don't fertilize nectarine trees in late summer or fall. Nectarines do best with a light spring fertilization.
3. Don't over water nectarine trees. Many nectarine trees can suffer from root rot. It is better to have water running slightly away from the tree trunk rather than forming a basin of water around the tree trunk.
Varieties worth trying in the area:
Mericrest - Produces tasty yellow-orange fruit. One of the hardier nectarines. Hardy in zones 5-9.