Sturgis, MI 49091 Frost Dates
Frost dates for Sturgis, MI, ZIP 49091
Typically, the last spring freeze lands around 04/30, roughly 245 days out. The first fall frost typically arrives around 10/16, about 167 frost-free days later.
The USDA Plant Hardiness Zone Map puts Sturgis in Zone 6a (-10 to -5°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 6a around Sturgis has about 7 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 04/17 and you're betting against frost in roughly 9 years out of 10. 05/15 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Sturgis compares
About 167 days separate Sturgis's last and first frost, putting it 29,914 of 40,283 ZIP codes nationally. Within MI, it ranks 362 of 1,153.
Learn more
the frost range explains how to read the range around Sturgis's dates instead of trusting one, and local microclimates explains what one yard in Sturgis can differ from the 49091 normal.