Stillwater, MN 55082 Frost Dates
Frost dates for Stillwater, MN, ZIP 55082
Typically, the last spring freeze lands around 04/30, roughly 245 days out. The first fall frost typically arrives around 10/11, about 163 frost-free days later.
The USDA Plant Hardiness Zone Map puts Stillwater 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 Stillwater 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.
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 Stillwater compares
About 163 days separate Stillwater's last and first frost, putting it 31,341 of 40,283 ZIP codes nationally. Within MN, it ranks 156 of 943.
Learn more
zone vs. frost date explains why Zone 4b and Stillwater's frost date answer different questions, and the frost range explains how to read the range around Stillwater's dates instead of trusting one.