Roscoe, MN 56371 Frost Dates
Frost dates for Roscoe, MN, ZIP 56371
Typically, the last spring freeze lands around 05/03, roughly 248 days out. The first fall frost typically arrives around 10/07, about 155 frost-free days later.
The USDA Plant Hardiness Zone Map puts Roscoe in Zone 4b (-25 to -20°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 4b around Roscoe 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.
Why 05/03 isn't a guarantee
05/03 is the middle of 30 years of NOAA records, not a promise. Plant by 04/21 and you're betting against frost in roughly 9 years out of 10. 05/17 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Roscoe compares
At roughly 155 frost-free days, Roscoe places 34,173 of 40,283 ZIP codes in this dataset. Within MN, it ranks 377 of 943.
Learn more
local microclimates explains what one yard in Roscoe can differ from the 56371 normal, and zone vs. frost date explains why Zone 4b and Roscoe's frost date answer different questions.