Sandusky, MI 48471 Frost Dates
Frost dates for Sandusky, MI, ZIP 48471
Around 05/02 is the usual last spring frost, about 247 days away. The first fall frost typically arrives around 10/16, about 165 frost-free days later.
The USDA Plant Hardiness Zone Map puts Sandusky 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 Sandusky 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.
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. 05/17 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Sandusky compares
Sandusky's growing season runs about 165 days, ranking 30,591 of 40,283 US ZIP codes measured here, longest to shortest. Within MI, it ranks 452 of 1,153.
Learn more
local microclimates explains what one yard in Sandusky can differ from the 48471 normal, and zone vs. frost date explains why Zone 6a and Sandusky's frost date answer different questions.