Brownton, MN 55312 Frost Dates
Frost dates for Brownton, MN, ZIP 55312
The last spring frost here typically falls around 04/30, about 245 days from today. The first fall frost typically arrives around 10/04, about 156 frost-free days later.
Zone 4b (-25 to -20°F average annual minimum) comes from the USDA Plant Hardiness Zone Map; the frost dates above are the 1991-2020 normal at the nearest reporting NOAA station for Brownton, not a forecast for this year.
What to do before the first frost
Zone 4b around Brownton has about 5 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 04/30 isn't a guarantee
04/30 is the middle of 30 years of NOAA records, not a promise. Plant by 04/17 and you're betting against frost in roughly 9 years out of 10. 05/13 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Brownton compares
About 156 days separate Brownton's last and first frost, putting it 33,758 of 40,283 ZIP codes nationally. Within MN, it ranks 325 of 943.
Learn more
the frost range explains how to read the range around Brownton's dates instead of trusting one, and local microclimates explains what one yard in Brownton can differ from the 55312 normal.