Westport, MN 56385 Frost Dates
Frost dates for Westport, MN, ZIP 56385
The last spring frost here typically falls around 05/11, about 256 days from today. The first fall frost typically arrives around 09/27, about 139 frost-free days later.
Westport sits in USDA Zone 4b (-25 to -20°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
Zone 4b around Westport has about 4 weeks left before the first fall frost — that's the usual window to get a cold frame up if you want to keep harvesting past it.
Why 05/11 isn't a guarantee
05/11 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. 05/27 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Westport compares
At roughly 139 frost-free days, Westport places 37,323 of 40,283 ZIP codes in this dataset. Within MN, it ranks 766 of 943.
Learn more
the frost range explains how to read the range around Westport's dates instead of trusting one, and local microclimates explains what one yard in Westport can differ from the 56385 normal.