Fairmont, MN 56031 Frost Dates
When can you plant in Fairmont, MN?
Typically, the last spring freeze lands around 04/25, roughly 240 days out. The first fall frost typically arrives around 10/14, about 171 frost-free days later.
Fairmont sits in USDA Zone 5a (-20 to -15°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
About 7 weeks of growing season left in Fairmont before the first fall frost — a cold frame or row cover can stretch harvest weeks past that date.
The actual range around Fairmont's last frost
04/25 is the middle of 30 years of NOAA records, not a promise. Plant by 04/12 and you're betting against frost in roughly 9 years out of 10. 05/06 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Fairmont compares
About 171 days separate Fairmont's last and first frost, putting it 28,614 of 40,283 ZIP codes nationally. Within MN, it ranks 76 of 943.
Learn more
zone vs. frost date covers why Zone 5a and Fairmont's frost date answer different questions. the frost range covers how to read the range around Fairmont's dates instead of trusting one.