Pembina, ND 58271 Frost Dates
58271, near Pembina, ND: the frost window
Typically, the last spring freeze lands around 05/16, roughly 261 days out. 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 Pembina 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
Pembina'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.
The actual range around Pembina's last frost
05/16 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 05/02 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.
Pembina against the rest of the dataset
Pembina's growing season runs about 137 days, ranking 37,564 of 40,283 US ZIP codes measured here, longest to shortest. Within ND, it ranks 212 of 405.
Learn more
Two guides worth reading on 58271: the frost range, on how to read the range around Pembina's dates instead of trusting one, and local microclimates, on what one yard in Pembina can differ from the 58271 normal.