Walhalla, ND 58282 Frost Dates
58282, near Walhalla, 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 09/30, roughly 139 days after the last spring frost.
The USDA Plant Hardiness Zone Map puts Walhalla 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
Walhalla'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.
How much risk comes with planting early here
05/12 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/29 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/27 and only about 1 year in 10 sees frost after that.
Walhalla against the rest of the dataset
At roughly 139 frost-free days, Walhalla places 37,255 of 40,283 ZIP codes in this dataset. Within ND, it ranks 142 of 405.
Learn more
Two guides worth reading on 58282: local microclimates, on what one yard in Walhalla can differ from the 58282 normal, and zone vs. frost date, on why Zone 4a and Walhalla's frost date answer different questions.