Edmore, ND 58330 Frost Dates
58330, near Edmore, ND: the frost window
Around 05/15 is the usual last spring frost, about 260 days away. Fall's first freeze usually shows up around 09/22, roughly 128 days after the last spring frost.
Edmore sits in USDA Zone 3b (-35 to -30°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
Edmore'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 05/15 isn't a guarantee
05/15 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 05/04 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/31 and only about 1 year in 10 sees frost after that.
Edmore against the rest of the dataset
About 128 days separate Edmore's last and first frost, putting it 38,584 of 40,283 ZIP codes nationally. Within ND, it ranks 323 of 405.
Learn more
Two guides worth reading on 58330: local microclimates, on what one yard in Edmore can differ from the 58330 normal, and zone vs. frost date, on why Zone 3b and Edmore's frost date answer different questions.