Hayfield, MN 55940 Frost Dates
Frost dates for Hayfield, MN, ZIP 55940
The last spring frost here typically falls around 04/30, about 245 days from today. The first fall frost typically arrives around 10/06, about 159 frost-free days later.
The USDA Plant Hardiness Zone Map puts Hayfield in Zone 5a (-20 to -15°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 5a around Hayfield has about 6 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 Hayfield's last frost
04/30 is the middle of 30 years of NOAA records, not a promise. Plant by 04/15 and you're betting against frost in roughly 9 years out of 10. 05/13 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Hayfield compares
About 159 days separate Hayfield's last and first frost, putting it 32,688 of 40,283 ZIP codes nationally. Within MN, it ranks 262 of 943.
Learn more
local microclimates explains what one yard in Hayfield can differ from the 55940 normal, and zone vs. frost date explains why Zone 5a and Hayfield's frost date answer different questions.