Flint, MI 48502 Frost Dates
Frost dates for Flint, MI, ZIP 48502
Around 05/03 is the usual last spring frost, about 248 days away. The first fall frost typically arrives around 10/13, about 162 frost-free days later.
Zone 6a (-10 to -5°F average annual minimum) comes from the USDA Plant Hardiness Zone Map; the frost dates above are the 1991-2020 normal at the nearest reporting NOAA station for Flint, not a forecast for this year.
What to do before the first frost
Zone 6a around Flint 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.
The actual range around Flint's last frost
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. 05/20 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Flint compares
Flint's growing season runs about 162 days, ranking 31,580 of 40,283 US ZIP codes measured here, longest to shortest. Within MI, it ranks 537 of 1,153.
Learn more
the frost range explains how to read the range around Flint's dates instead of trusting one, and local microclimates explains what one yard in Flint can differ from the 48502 normal.