Utah State University Extension
Hummingbirds only occur in the western hemisphere (Mayr, 2005). While most of these species live in tropical climates, there are many that migrate into the U.S. during the summer months. Several species breed and spend their summers in Utah and the southwest U.S.
Frey, S. Nicole and Heaton, Heather, "Using Plants to Attract Hummingbirds to Your Yard" (2003). All Current Publications. Paper 1254.