Morrison, IL 61270 Frost Dates
Frost dates for Morrison, IL, ZIP 61270
Around 04/26 is the usual last spring frost, about 241 days away. The first fall frost typically arrives around 10/13, about 167 frost-free days later.
The USDA Plant Hardiness Zone Map puts Morrison in Zone 5b (-15 to -10°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 5b around Morrison 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.
Why 04/26 isn't a guarantee
04/26 is the middle of 30 years of NOAA records, not a promise. Plant by 04/13 and you're betting against frost in roughly 9 years out of 10. 05/11 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Morrison compares
About 167 days separate Morrison's last and first frost, putting it 29,975 of 40,283 ZIP codes nationally. Within IL, it ranks 1,454 of 1,548.
Learn more
local microclimates explains what one yard in Morrison can differ from the 61270 normal, and zone vs. frost date explains why Zone 5b and Morrison's frost date answer different questions.