Chisholm, MN 55781 Frost Dates
Frost dates for Chisholm, MN, ZIP 55781
The last spring frost here typically falls around 06/01, about 277 days from today. The first fall frost typically arrives around 09/15, about 104 frost-free days later.
Chisholm sits in USDA Zone 3b (-35 to -30°F average annual minimum). The dates above are NOAA's 1991-2020 normal at the nearest reporting station, a 30-year average, not a forecast.
What to do before the first frost
Zone 3b around Chisholm has about 3 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 06/01 isn't a guarantee
06/01 is the middle of 30 years of NOAA records, not a promise. Plant by 05/18 and you're betting against frost in roughly 9 years out of 10. 06/18 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Chisholm compares
Chisholm's growing season runs about 104 days, ranking 39,606 of 40,283 US ZIP codes measured here, longest to shortest. Within MN, it ranks 919 of 943.
Learn more
zone vs. frost date explains why Zone 3b and Chisholm's frost date answer different questions, and the frost range explains how to read the range around Chisholm's dates instead of trusting one.