Arnegard, ND 58835 Frost Dates
Arnegard, ND: when does the frost end?
Typically, the last spring freeze lands around 05/09, roughly 254 days out. Fall's first freeze usually shows up around 09/27, roughly 139 days after the last spring frost.
The USDA Plant Hardiness Zone Map puts Arnegard 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
With roughly 4 weeks until Arnegard's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
Why 05/09 isn't a guarantee
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.
Arnegard against the rest of the dataset
Arnegard's growing season runs about 139 days, ranking 37,275 of 40,283 US ZIP codes measured here, longest to shortest. Within ND, it ranks 148 of 405.
Learn more
Before leaning on 58835's figures: zone vs. frost date explains why Zone 4a and Arnegard's frost date answer different questions, while the frost range explains how to read the range around Arnegard's dates instead of trusting one.