Big Falls, MN 56627 Frost Dates
Frost dates for Big Falls, MN, ZIP 56627
The last spring frost here typically falls around 05/24, about 269 days from today. The first fall frost typically arrives around 09/20, about 117 frost-free days later.
Big Falls 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 Big Falls 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.
The actual range around Big Falls's last frost
05/24 is the middle of 30 years of NOAA records, not a promise. Plant by 05/06 and you're betting against frost in roughly 9 years out of 10. 06/06 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Big Falls compares
Big Falls's growing season runs about 117 days, ranking 39,261 of 40,283 US ZIP codes measured here, longest to shortest. Within MN, it ranks 895 of 943.
Learn more
zone vs. frost date explains why Zone 3b and Big Falls's frost date answer different questions, and the frost range explains how to read the range around Big Falls's dates instead of trusting one.