Flint, MI 48506 Frost Dates
Frost dates for Flint, MI, ZIP 48506
The last spring frost here typically falls around 05/08, about 253 days from today. The first fall frost typically arrives around 10/05, about 148 frost-free days later.
The USDA Plant Hardiness Zone Map puts Flint 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 Flint has about 5 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
05/08 is the middle of 30 years of NOAA records, not a promise. Plant by 04/28 and you're betting against frost in roughly 9 years out of 10. 05/22 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Flint compares
About 148 days separate Flint's last and first frost, putting it 35,611 of 40,283 ZIP codes nationally. Within MI, it ranks 828 of 1,153.
Learn more
local microclimates explains what one yard in Flint can differ from the 48506 normal, and zone vs. frost date explains why Zone 6a and Flint's frost date answer different questions.