Swanville, MN 56382 Frost Dates
Frost dates for Swanville, MN, ZIP 56382
Typically, the last spring freeze lands around 05/13, roughly 258 days out. The first fall frost typically arrives around 09/27, about 134 frost-free days later.
Swanville sits in USDA Zone 4a (-30 to -25°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 4a around Swanville 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.
The actual range around Swanville's last frost
05/13 is the middle of 30 years of NOAA records, not a promise. Plant by 05/01 and you're betting against frost in roughly 9 years out of 10. 05/28 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Swanville compares
About 134 days separate Swanville's last and first frost, putting it 38,016 of 40,283 ZIP codes nationally. Within MN, it ranks 818 of 943.
Learn more
zone vs. frost date explains why Zone 4a and Swanville's frost date answer different questions, and the frost range explains how to read the range around Swanville's dates instead of trusting one.