Hanover, MN 55341 Frost Dates
Frost dates for Hanover, MN, ZIP 55341
Typically, the last spring freeze lands around 04/30, roughly 245 days out. The first fall frost typically arrives around 10/09, about 163 frost-free days later.
Hanover 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 Hanover has about 6 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.
How much risk comes with planting early here
04/30 is the middle of 30 years of NOAA records, not a promise. Plant by 04/15 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 Hanover compares
About 163 days separate Hanover's last and first frost, putting it 31,380 of 40,283 ZIP codes nationally. Within MN, it ranks 165 of 943.
Learn more
the frost range explains how to read the range around Hanover's dates instead of trusting one, and local microclimates explains what one yard in Hanover can differ from the 55341 normal.