While below freezing temperatures have occurred in the coldest Star Valley locations even last August, today is officially the end of the growing season as the typical warmest part of the valley dip below freezing with Star Valley Ranch bottoming out at 30F. of the coldest valley locations, Double L Ranch, northwest of Etna along the Salt River was a frigid 16F.
Following is a plot of the minimum temperatures around the area this Friday morning.
Note the region low of 13F in the Bondurant area.
For comparison the first time below freezing temperatures were reported at Star Valley Ranch in 2017 was on September 17.