Detroit Lakes, MN 56501 Frost Dates
When can you plant in Detroit Lakes, MN?
Typically, the last spring freeze lands around 05/15, roughly 260 days out. The first fall frost typically arrives around 09/24, about 130 frost-free days later.
The USDA Plant Hardiness Zone Map puts Detroit Lakes 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 4 weeks of growing season left in Detroit Lakes before the first fall frost — a cold frame or row cover can stretch harvest weeks past that date.
Why 05/15 isn't a guarantee
05/15 is the middle of 30 years of NOAA records, not a promise. Plant by 05/02 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 Detroit Lakes compares
About 130 days separate Detroit Lakes's last and first frost, putting it 38,366 of 40,283 ZIP codes nationally. Within MN, it ranks 843 of 943.
Learn more
local microclimates covers what one yard in Detroit Lakes can differ from the 56501 normal. zone vs. frost date covers why Zone 4a and Detroit Lakes's frost date answer different questions.