St. Peter, MN 56082 Frost Dates
Frost dates for St. Peter, MN, ZIP 56082
The last spring frost here typically falls around 05/02, about 247 days from today. The first fall frost typically arrives around 10/04, about 153 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 St. Peter, not a forecast for this year.
What to do before the first frost
Zone 4b around St. Peter 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 05/02 isn't a guarantee
05/02 is the middle of 30 years of NOAA records, not a promise. Plant by 04/19 and you're betting against frost in roughly 9 years out of 10. 05/14 is the safer bet, historically only a 1-in-10 chance of frost that late.
How St. Peter compares
At roughly 153 frost-free days, St. Peter places 34,491 of 40,283 ZIP codes in this dataset. Within MN, it ranks 402 of 943.
Learn more
the frost range explains how to read the range around St. Peter's dates instead of trusting one, and local microclimates explains what one yard in St. Peter can differ from the 56082 normal.