St. Michael, MN 55376 Frost Dates
Frost dates for St. Michael, MN, ZIP 55376
Around 04/30 is the usual last spring frost, about 245 days away. The first fall frost typically arrives around 10/09, about 163 frost-free days later.
St. Michael 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 St. Michael 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 St. Michael compares
St. Michael's growing season runs about 163 days, ranking 31,329 of 40,283 US ZIP codes measured here, longest to shortest. Within MN, it ranks 152 of 943.
Learn more
the frost range explains how to read the range around St. Michael's dates instead of trusting one, and local microclimates explains what one yard in St. Michael can differ from the 55376 normal.