Duchesne, UT 84021 Frost Dates
84021, near Duchesne, UT: the frost window
Around 05/06 is the usual last spring frost, about 251 days away. Fall's first freeze usually shows up around 10/05, roughly 150 days after the last spring frost.
The USDA Plant Hardiness Zone Map puts Duchesne 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
Duchesne'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
05/06 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/22 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/26 and only about 1 year in 10 sees frost after that.
Duchesne against the rest of the dataset
Duchesne's growing season runs about 150 days, ranking 35,319 of 40,283 US ZIP codes measured here, longest to shortest. Within UT, it ranks 198 of 344.
Learn more
Two guides worth reading on 84021: the frost range, on how to read the range around Duchesne's dates instead of trusting one, and local microclimates, on what one yard in Duchesne can differ from the 84021 normal.