Koosharem, UT 84744 Frost Dates
Koosharem, UT: when does the frost end?
Typically, the last spring freeze lands around 06/06, roughly 282 days out. Fall's first freeze usually shows up around 09/21, roughly 104 days after the last spring frost.
The USDA Plant Hardiness Zone Map puts Koosharem in Zone 6a (-10 to -5°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
With roughly 3 weeks until Koosharem's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
Why 06/06 isn't a guarantee
06/06 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 05/24 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 06/26 and only about 1 year in 10 sees frost after that.
Koosharem against the rest of the dataset
About 104 days separate Koosharem's last and first frost, putting it 39,616 of 40,283 ZIP codes nationally. Within UT, it ranks 330 of 344.
Learn more
Before leaning on 84744's figures: zone vs. frost date explains why Zone 6a and Koosharem's frost date answer different questions, while the frost range explains how to read the range around Koosharem's dates instead of trusting one.