Hyrum, UT 84319 Frost Dates
84319, near Hyrum, UT: the frost window
The last spring frost here typically falls around 05/12, about 257 days from today. Fall's first freeze usually shows up around 09/28, roughly 138 days after the last spring frost.
Zone 6a (-10 to -5°F average annual minimum) comes from the USDA Plant Hardiness Zone Map; the frost dates above are the 1991-2020 normal at the nearest reporting NOAA station for Hyrum, not a forecast for this year.
Stretching the season past the first frost
Hyrum'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.
Why 05/12 isn't a guarantee
05/12 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/30 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/29 and only about 1 year in 10 sees frost after that.
Hyrum against the rest of the dataset
At roughly 138 frost-free days, Hyrum places 37,363 of 40,283 ZIP codes in this dataset. Within UT, it ranks 223 of 344.
Learn more
Two guides worth reading on 84319: the frost range, on how to read the range around Hyrum's dates instead of trusting one, and local microclimates, on what one yard in Hyrum can differ from the 84319 normal.