American Fork, UT 84003 Frost Dates
American Fork, UT: when does the frost end?
Typically, the last spring freeze lands around 04/17, roughly 232 days out. Fall's first freeze usually shows up around 10/25, roughly 188 days after the last spring frost.
American Fork sits in USDA Zone 6a (-10 to -5°F average annual minimum). The dates above are NOAA's 1991-2020 normal at the nearest reporting station, a 30-year average, not a forecast.
Stretching the season past the first frost
With roughly 8 weeks until American Fork's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
Why 04/17 isn't a guarantee
04/17 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 03/30 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/07 and only about 1 year in 10 sees frost after that.
American Fork against the rest of the dataset
American Fork's growing season runs about 188 days, ranking 21,843 of 40,283 US ZIP codes measured here, longest to shortest. Within UT, it ranks 74 of 344.
Learn more
Before leaning on 84003's figures: the frost range explains how to read the range around American Fork's dates instead of trusting one, while local microclimates explains what one yard in American Fork can differ from the 84003 normal.