Parowan, UT 84772 Frost Dates
84772, near Parowan, UT: the frost window
Typically, the last spring freeze lands around 05/21, roughly 266 days out. Fall's first freeze usually shows up around 09/29, roughly 130 days after the last spring frost.
Zone 6b (-5 to 0°F average annual minimum) comes from the USDA Plant Hardiness Zone Map; the frost dates above are the 1991-2020 normal at the nearest reporting NOAA station for Parowan, not a forecast for this year.
Stretching the season past the first frost
Parowan's growing season runs out in roughly 5 weeks — a cold frame or greenhouse kit is the usual way to keep cool-weather crops going past the first frost.
Why 05/21 isn't a guarantee
05/21 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 05/04 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 06/08 and only about 1 year in 10 sees frost after that.
Parowan against the rest of the dataset
Parowan's growing season runs about 130 days, ranking 38,375 of 40,283 US ZIP codes measured here, longest to shortest. Within UT, it ranks 246 of 344.
Learn more
Two guides worth reading on 84772: the frost range, on how to read the range around Parowan's dates instead of trusting one, and local microclimates, on what one yard in Parowan can differ from the 84772 normal.