Hanover, MI 49257 Frost Dates
Frost dates for Hanover, MI, ZIP 49257
The last spring frost here typically falls around 05/03, about 248 days from today. The first fall frost typically arrives around 10/12, about 161 frost-free days later.
The USDA Plant Hardiness Zone Map puts Hanover 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 Hanover 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
05/03 is the middle of 30 years of NOAA records, not a promise. Plant by 04/20 and you're betting against frost in roughly 9 years out of 10. 05/19 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Hanover compares
About 161 days separate Hanover's last and first frost, putting it 32,138 of 40,283 ZIP codes nationally. Within MI, it ranks 603 of 1,153.
Learn more
zone vs. frost date explains why Zone 6a and Hanover's frost date answer different questions, and the frost range explains how to read the range around Hanover's dates instead of trusting one.