Correll, MN 56227 Frost Dates
Frost dates for Correll, MN, ZIP 56227
The last spring frost here typically falls around 05/01, about 246 days from today. The first fall frost typically arrives around 10/08, about 159 frost-free days later.
Zone 4b (-25 to -20°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 Correll, not a forecast for this year.
What to do before the first frost
Zone 4b around Correll 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 05/01 isn't a guarantee
05/01 is the middle of 30 years of NOAA records, not a promise. Plant by 04/17 and you're betting against frost in roughly 9 years out of 10. 05/14 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Correll compares
Correll's growing season runs about 159 days, ranking 32,816 of 40,283 US ZIP codes measured here, longest to shortest. Within MN, it ranks 281 of 943.
Learn more
local microclimates explains what one yard in Correll can differ from the 56227 normal, and zone vs. frost date explains why Zone 4b and Correll's frost date answer different questions.