McHenry, ND 58464 Frost Dates
58464, near McHenry, ND: the frost window
Around 05/12 is the usual last spring frost, about 257 days away. 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 McHenry 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
McHenry'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.
McHenry against the rest of the dataset
At roughly 139 frost-free days, McHenry places 37,314 of 40,283 ZIP codes in this dataset. Within ND, it ranks 165 of 405.
Learn more
Two guides worth reading on 58464: the frost range, on how to read the range around McHenry's dates instead of trusting one, and local microclimates, on what one yard in McHenry can differ from the 58464 normal.