Williston, ND 58853 Frost Dates
Frost dates for Williston, ND, ZIP 58853
Typically, the last spring freeze lands around 05/13, roughly 258 days out. The first fall frost typically arrives around 09/26, about 135 frost-free days later.
The USDA Plant Hardiness Zone Map puts Williston in Zone 4a (-30 to -25°F average annual minimum); frost dates are NOAA's 1991-2020 station normal, not this year's forecast.
What to do before the first frost
Zone 4a around Williston has about 4 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.
The actual range around Williston's last frost
05/13 is the middle of 30 years of NOAA records, not a promise. Plant by 05/01 and you're betting against frost in roughly 9 years out of 10. 05/25 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Williston compares
About 135 days separate Williston's last and first frost, putting it 37,826 of 40,283 ZIP codes nationally. Within ND, it ranks 258 of 405.
Learn more
zone vs. frost date explains why Zone 4a and Williston's frost date answer different questions, and the frost range explains how to read the range around Williston's dates instead of trusting one.