Glenfield, ND 58484 Frost Dates
58484, near Glenfield, 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.
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 Glenfield, not a forecast for this year.
Stretching the season past the first frost
Glenfield'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.
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 04/30 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.
Glenfield against the rest of the dataset
Glenfield's growing season runs about 139 days, ranking 37,302 of 40,283 US ZIP codes measured here, longest to shortest. Within ND, it ranks 160 of 405.
Learn more
Two guides worth reading on 58484: local microclimates, on what one yard in Glenfield can differ from the 58484 normal, and zone vs. frost date, on why Zone 4a and Glenfield's frost date answer different questions.