Dunseith, ND 58329 Frost Dates
58329, near Dunseith, ND: the frost window
Around 05/19 is the usual last spring frost, about 264 days away. Fall's first freeze usually shows up around 09/24, roughly 126 days after the last spring frost.
The USDA Plant Hardiness Zone Map puts Dunseith in Zone 3b (-35 to -30°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
Dunseith'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.
The actual range around Dunseith's last frost
05/19 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 05/05 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 06/01 and only about 1 year in 10 sees frost after that.
Dunseith against the rest of the dataset
Dunseith's growing season runs about 126 days, ranking 38,703 of 40,283 US ZIP codes measured here, longest to shortest. Within ND, it ranks 356 of 405.
Learn more
Two guides worth reading on 58329: zone vs. frost date, on why Zone 3b and Dunseith's frost date answer different questions, and the frost range, on how to read the range around Dunseith's dates instead of trusting one.