Fairfax, MN 55332 Frost Dates
When can you plant in Fairfax, MN?
Around 04/30 is the usual last spring frost, about 245 days away. The first fall frost typically arrives around 10/04, about 157 frost-free days later.
The USDA Plant Hardiness Zone Map puts Fairfax in Zone 4b (-25 to -20°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 Fairfax before the first fall frost — a cold frame or row cover can stretch harvest weeks past that date.
How much risk comes with planting early here
04/30 is the middle of 30 years of NOAA records, not a promise. Plant by 04/16 and you're betting against frost in roughly 9 years out of 10. 05/14 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Fairfax compares
About 157 days separate Fairfax's last and first frost, putting it 33,371 of 40,283 ZIP codes nationally. Within MN, it ranks 303 of 943.
Learn more
zone vs. frost date covers why Zone 4b and Fairfax's frost date answer different questions. the frost range covers how to read the range around Fairfax's dates instead of trusting one.