Marshall, MI 49018 Frost Dates
Frost dates for Marshall, MI, ZIP 49018
The last spring frost here typically falls around 04/30, about 245 days from today. The first fall frost typically arrives around 10/19, about 170 frost-free days later.
Marshall sits in USDA Zone 6a (-10 to -5°F average annual minimum). The dates above are NOAA's 1991-2020 normal at the nearest reporting station, a 30-year average, not a forecast.
What to do before the first frost
Zone 6a around Marshall 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 Marshall's last frost
04/30 is the middle of 30 years of NOAA records, not a promise. Plant by 04/16 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 Marshall compares
About 170 days separate Marshall's last and first frost, putting it 28,960 of 40,283 ZIP codes nationally. Within MI, it ranks 309 of 1,153.
Learn more
local microclimates explains what one yard in Marshall can differ from the 49018 normal, and zone vs. frost date explains why Zone 6a and Marshall's frost date answer different questions.