Marshall, IL 62441 Frost Dates
Frost dates for Marshall, IL, ZIP 62441
The last spring frost here typically falls around 04/21, about 236 days from today. The first fall frost typically arrives around 10/20, about 179 frost-free days later.
The USDA Plant Hardiness Zone Map puts Marshall 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 Marshall has about 8 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
04/21 is the middle of 30 years of NOAA records, not a promise. Plant by 04/06 and you're betting against frost in roughly 9 years out of 10. 05/09 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Marshall compares
About 179 days separate Marshall's last and first frost, putting it 25,298 of 40,283 ZIP codes nationally. Within IL, it ranks 1,032 of 1,548.
Learn more
local microclimates explains what one yard in Marshall can differ from the 62441 normal, and zone vs. frost date explains why Zone 6a and Marshall's frost date answer different questions.