Moroni, UT 84646 Frost Dates
84646, near Moroni, UT: the frost window
Typically, the last spring freeze lands around 05/26, roughly 271 days out. Fall's first freeze usually shows up around 09/25, roughly 119 days after the last spring frost.
The USDA Plant Hardiness Zone Map puts Moroni in Zone 5b (-15 to -10°F average annual minimum); frost dates are NOAA's 1991-2020 station normal, not this year's forecast.
Stretching the season past the first frost
Moroni's growing season runs out in roughly 4 weeks — a cold frame or greenhouse kit is the usual way to keep cool-weather crops going past the first frost.
How much risk comes with planting early here
05/26 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 05/10 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 06/13 and only about 1 year in 10 sees frost after that.
Moroni against the rest of the dataset
About 119 days separate Moroni's last and first frost, putting it 39,150 of 40,283 ZIP codes nationally. Within UT, it ranks 299 of 344.
Learn more
Two guides worth reading on 84646: the frost range, on how to read the range around Moroni's dates instead of trusting one, and local microclimates, on what one yard in Moroni can differ from the 84646 normal.