Perham, MN 56573 Frost Dates
When can you plant in Perham, MN?
Typically, the last spring freeze lands around 05/10, roughly 255 days out. The first fall frost typically arrives around 09/29, about 141 frost-free days later.
The USDA Plant Hardiness Zone Map puts Perham in Zone 4a (-30 to -25°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 Perham 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
05/10 is the middle of 30 years of NOAA records, not a promise. Plant by 04/28 and you're betting against frost in roughly 9 years out of 10. 05/24 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Perham compares
Perham's growing season runs about 141 days, ranking 36,906 of 40,283 US ZIP codes measured here, longest to shortest. Within MN, it ranks 715 of 943.
Learn more
local microclimates covers what one yard in Perham can differ from the 56573 normal. zone vs. frost date covers why Zone 4a and Perham's frost date answer different questions.