Cooperstown, ND 58425 Frost Dates
Cooperstown, ND: when does the frost end?
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
With roughly 4 weeks until Cooperstown's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
The actual range around Cooperstown's last frost
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
At roughly 139 frost-free days, Cooperstown places 37,249 of 40,283 ZIP codes in this dataset. Within ND, it ranks 139 of 405.
Learn more
Before leaning on 58425's figures: the frost range explains how to read the range around Cooperstown's dates instead of trusting one, while local microclimates explains what one yard in Cooperstown can differ from the 58425 normal.