St. Francis, MN 55070 Frost Dates
Frost dates for St. Francis, MN, ZIP 55070
Typically, the last spring freeze lands around 05/01, roughly 246 days out. The first fall frost typically arrives around 10/07, about 158 frost-free days later.
The USDA Plant Hardiness Zone Map puts St. Francis 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 St. Francis 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.
The actual range around St. Francis's last frost
05/01 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. 05/17 is the safer bet, historically only a 1-in-10 chance of frost that late.
How St. Francis compares
About 158 days separate St. Francis's last and first frost, putting it 32,953 of 40,283 ZIP codes nationally. Within MN, it ranks 284 of 943.
Learn more
local microclimates explains what one yard in St. Francis can differ from the 55070 normal, and zone vs. frost date explains why Zone 4b and St. Francis's frost date answer different questions.