Princeton, MN 55371 Frost Dates
Frost dates for Princeton, MN, ZIP 55371
The last spring frost here typically falls around 05/07, about 252 days from today. The first fall frost typically arrives around 09/28, about 144 frost-free days later.
The USDA Plant Hardiness Zone Map puts Princeton in Zone 4b (-25 to -20°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
Zone 4b around Princeton 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.
How much risk comes with planting early here
05/07 is the middle of 30 years of NOAA records, not a promise. Plant by 04/24 and you're betting against frost in roughly 9 years out of 10. 05/22 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Princeton compares
About 144 days separate Princeton's last and first frost, putting it 36,361 of 40,283 ZIP codes nationally. Within MN, it ranks 649 of 943.
Learn more
the frost range explains how to read the range around Princeton's dates instead of trusting one, and local microclimates explains what one yard in Princeton can differ from the 55371 normal.