Harwood, ND 58042 Frost Dates
58042, near Harwood, ND: the frost window
Around 05/10 is the usual last spring frost, about 255 days away. Fall's first freeze usually shows up around 09/30, roughly 143 days after the last spring frost.
The USDA Plant Hardiness Zone Map puts Harwood 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
Harwood'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.
Why 05/10 isn't a guarantee
05/10 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/27 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/23 and only about 1 year in 10 sees frost after that.
Harwood against the rest of the dataset
About 143 days separate Harwood's last and first frost, putting it 36,568 of 40,283 ZIP codes nationally. Within ND, it ranks 90 of 405.
Learn more
Two guides worth reading on 58042: the frost range, on how to read the range around Harwood's dates instead of trusting one, and local microclimates, on what one yard in Harwood can differ from the 58042 normal.