Big Falls, MN 56658 Frost Dates
When can you plant in Big Falls, MN?
Around 05/24 is the usual last spring frost, about 269 days away. The first fall frost typically arrives around 09/20, about 117 frost-free days later.
Zone 3b (-35 to -30°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 Big Falls, not a forecast for this year.
What to do before the first frost
About 3 weeks of growing season left in Big Falls before the first fall frost — a cold frame or row cover can stretch harvest weeks past that date.
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 39,262 of 40,283 US ZIP codes measured here, longest to shortest. Within MN, it ranks 896 of 943.
Learn more
zone vs. frost date covers why Zone 3b and Big Falls's frost date answer different questions. the frost range covers how to read the range around Big Falls's dates instead of trusting one.