Cooperstown, ND 58452 Frost Dates
58452, near Cooperstown, ND: the frost window
Typically, the last spring freeze lands around 05/12, roughly 257 days out. Fall's first freeze usually shows up around 09/28, roughly 139 days after the last spring frost.
The USDA Plant Hardiness Zone Map puts Cooperstown in Zone 4a (-30 to -25°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
Cooperstown'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 05/25 and only about 1 year in 10 sees frost after that.
Cooperstown against the rest of the dataset
About 139 days separate Cooperstown's last and first frost, putting it 37,250 of 40,283 ZIP codes nationally. Within ND, it ranks 140 of 405.
Learn more
Two guides worth reading on 58452: the frost range, on how to read the range around Cooperstown's dates instead of trusting one, and local microclimates, on what one yard in Cooperstown can differ from the 58452 normal.