Bigfork, MN 56637 Frost Dates
When can you plant in Bigfork, MN?
Typically, the last spring freeze lands around 05/14, roughly 259 days out. The first fall frost typically arrives around 10/02, about 140 frost-free days later.
The USDA Plant Hardiness Zone Map puts Bigfork in Zone 3b (-35 to -30°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
About 5 weeks of growing season left in Bigfork before the first fall frost — a cold frame or row cover can stretch harvest weeks past that date.
The actual range around Bigfork's last frost
05/14 is the middle of 30 years of NOAA records, not a promise. Plant by 04/30 and you're betting against frost in roughly 9 years out of 10. 05/30 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Bigfork compares
Bigfork's growing season runs about 140 days, ranking 37,137 of 40,283 US ZIP codes measured here, longest to shortest. Within MN, it ranks 745 of 943.
Learn more
zone vs. frost date covers why Zone 3b and Bigfork's frost date answer different questions. the frost range covers how to read the range around Bigfork's dates instead of trusting one.