Alton, UT 84710 Frost Dates
84710, near Alton, UT: the frost window
The last spring frost here typically falls around 06/01, about 277 days from today. Fall's first freeze usually shows up around 09/30, roughly 120 days after the last spring frost.
The USDA Plant Hardiness Zone Map puts Alton 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
Alton'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.
How much risk comes with planting early here
06/01 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 05/16 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 06/15 and only about 1 year in 10 sees frost after that.
Alton against the rest of the dataset
At roughly 120 frost-free days, Alton places 39,111 of 40,283 ZIP codes in this dataset. Within UT, it ranks 296 of 344.
Learn more
Two guides worth reading on 84710: zone vs. frost date, on why Zone 6a and Alton's frost date answer different questions, and the frost range, on how to read the range around Alton's dates instead of trusting one.