Granville, ND 58741 Frost Dates
58741, near Granville, ND: the frost window
The last spring frost here typically falls around 05/09, about 254 days from today. Fall's first freeze usually shows up around 10/01, roughly 145 days after the last spring frost.
Zone 4a (-30 to -25°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 Granville, not a forecast for this year.
Stretching the season past the first frost
Granville'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.
The actual range around Granville's last frost
05/09 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/28 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/22 and only about 1 year in 10 sees frost after that.
Granville against the rest of the dataset
At roughly 145 frost-free days, Granville places 36,285 of 40,283 ZIP codes in this dataset. Within ND, it ranks 60 of 405.
Learn more
Two guides worth reading on 58741: local microclimates, on what one yard in Granville can differ from the 58741 normal, and zone vs. frost date, on why Zone 4a and Granville's frost date answer different questions.