Crookston, MN 56716 Frost Dates
Frost dates for Crookston, MN, ZIP 56716
Around 05/11 is the usual last spring frost, about 256 days away. The first fall frost typically arrives around 09/27, about 138 frost-free days later.
The USDA Plant Hardiness Zone Map puts Crookston in Zone 4a (-30 to -25°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 4a around Crookston 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 04/28 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 Crookston compares
At roughly 138 frost-free days, Crookston places 37,377 of 40,283 ZIP codes in this dataset. Within MN, it ranks 767 of 943.
Learn more
zone vs. frost date explains why Zone 4a and Crookston's frost date answer different questions, and the frost range explains how to read the range around Crookston's dates instead of trusting one.