Altamont, UT 84051 Frost Dates
84051, near Altamont, UT: the frost window
The last spring frost here typically falls around 05/31, about 276 days from today. Fall's first freeze usually shows up around 09/23, roughly 112 days after the last spring frost.
The USDA Plant Hardiness Zone Map puts Altamont 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
Altamont'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.
The actual range around Altamont's last frost
05/31 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 06/16 and only about 1 year in 10 sees frost after that.
Altamont against the rest of the dataset
Altamont's growing season runs about 112 days, ranking 39,440 of 40,283 US ZIP codes measured here, longest to shortest. Within UT, it ranks 323 of 344.
Learn more
Two guides worth reading on 84051: the frost range, on how to read the range around Altamont's dates instead of trusting one, and local microclimates, on what one yard in Altamont can differ from the 84051 normal.