Hettinger, ND 58639 Frost Dates
58639, near Hettinger, ND: the frost window
The last spring frost here typically falls around 05/24, about 269 days from today. Fall's first freeze usually shows up around 09/18, roughly 115 days after the last spring frost.
Zone 4b (-25 to -20°F average annual minimum) comes from the USDA Plant Hardiness Zone Map; the frost dates above are the 1991-2020 normal at the nearest reporting NOAA station for Hettinger, not a forecast for this year.
Stretching the season past the first frost
Hettinger's growing season runs out in roughly 3 weeks — a cold frame or greenhouse kit is the usual way to keep cool-weather crops going past the first frost.
How much risk comes with planting early here
05/24 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 05/11 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 06/10 and only about 1 year in 10 sees frost after that.
Hettinger against the rest of the dataset
At roughly 115 frost-free days, Hettinger places 39,321 of 40,283 ZIP codes in this dataset. Within ND, it ranks 401 of 405.
Learn more
Two guides worth reading on 58639: the frost range, on how to read the range around Hettinger's dates instead of trusting one, and local microclimates, on what one yard in Hettinger can differ from the 58639 normal.