Belfield, ND 58622 Frost Dates
Frost dates for Belfield, ND, ZIP 58622
Typically, the last spring freeze lands around 05/09, roughly 254 days out. The first fall frost typically arrives around 09/30, about 142 frost-free days later.
Belfield sits in USDA Zone 4b (-25 to -20°F average annual minimum). The dates above are NOAA's 1991-2020 normal at the nearest reporting station, a 30-year average, not a forecast.
What to do before the first frost
Zone 4b around Belfield has about 5 weeks left before the first fall frost — that's the usual window to get a cold frame up if you want to keep harvesting past it.
Why 05/09 isn't a guarantee
05/09 is the middle of 30 years of NOAA records, not a promise. Plant by 04/30 and you're betting against frost in roughly 9 years out of 10. 05/21 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Belfield compares
About 142 days separate Belfield's last and first frost, putting it 36,771 of 40,283 ZIP codes nationally. Within ND, it ranks 108 of 405.
Learn more
zone vs. frost date explains why Zone 4b and Belfield's frost date answer different questions, and the frost range explains how to read the range around Belfield's dates instead of trusting one.