Erethizon dorsatum
The North American porcupine, Erethizon dorsatum, is common in Utah, where it can be found in a variety of habitats including; coniferous forest, mixed forest areas, riparian zones, deserts, and shrubland. It is actually a large rodent. Hollow trees, hollow logs, and small caves are used as dens. The North American porcupine does not hibernate, they remain active year-round feeding on the needles and bark of coniferous trees during the winter.
Photo Credit: Bryant Shoblom
The below list of places are great places to possibly see the North American porcupine.
The below links contain further information.