Williams, MN 56686 Frost Dates
Frost dates for Williams, MN, ZIP 56686
The last spring frost here typically falls around 05/14, about 259 days from today. The first fall frost typically arrives around 09/26, about 135 frost-free days later.
The USDA Plant Hardiness Zone Map puts Williams in Zone 3b (-35 to -30°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 3b around Williams 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 Williams's last frost
05/14 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. 05/28 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Williams compares
About 135 days separate Williams's last and first frost, putting it 37,929 of 40,283 ZIP codes nationally. Within MN, it ranks 807 of 943.
Learn more
the frost range explains how to read the range around Williams's dates instead of trusting one, and local microclimates explains what one yard in Williams can differ from the 56686 normal.