Delta, UT 84624 Frost Dates
84624, near Delta, UT: the frost window
Around 05/16 is the usual last spring frost, about 261 days away. Fall's first freeze usually shows up around 09/29, roughly 137 days after the last spring frost.
The USDA Plant Hardiness Zone Map puts Delta 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
Delta'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.
Why 05/16 isn't a guarantee
05/16 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/29 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 06/05 and only about 1 year in 10 sees frost after that.
Delta against the rest of the dataset
About 137 days separate Delta's last and first frost, putting it 37,514 of 40,283 ZIP codes nationally. Within UT, it ranks 227 of 344.
Learn more
Two guides worth reading on 84624: the frost range, on how to read the range around Delta's dates instead of trusting one, and local microclimates, on what one yard in Delta can differ from the 84624 normal.