Amidon, ND 58620 Frost Dates
58620, near Amidon, ND: the frost window
The last spring frost here typically falls around 05/12, about 257 days from today. Fall's first freeze usually shows up around 09/29, roughly 136 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 Amidon, not a forecast for this year.
Stretching the season past the first frost
Amidon'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.
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 05/02 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/28 and only about 1 year in 10 sees frost after that.
Amidon against the rest of the dataset
Amidon's growing season runs about 136 days, ranking 37,822 of 40,283 US ZIP codes measured here, longest to shortest. Within ND, it ranks 255 of 405.
Learn more
Two guides worth reading on 58620: the frost range, on how to read the range around Amidon's dates instead of trusting one, and local microclimates, on what one yard in Amidon can differ from the 58620 normal.