Ulen, MN 56585 Frost Dates
Frost dates for Ulen, MN, ZIP 56585
The last spring frost here typically falls around 05/11, about 256 days from today. The first fall frost typically arrives around 09/27, about 137 frost-free days later.
Zone 4a (-30 to -25°F average annual minimum) comes from the USDA Plant Hardiness Zone Map; the frost dates above are the 1991-2020 normal at the nearest reporting NOAA station for Ulen, not a forecast for this year.
What to do before the first frost
Zone 4a around Ulen 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.
Why 05/11 isn't a guarantee
05/11 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. 05/25 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Ulen compares
At roughly 137 frost-free days, Ulen places 37,565 of 40,283 ZIP codes in this dataset. Within MN, it ranks 785 of 943.
Learn more
local microclimates explains what one yard in Ulen can differ from the 56585 normal, and zone vs. frost date explains why Zone 4a and Ulen's frost date answer different questions.