Caledonia, IL 61011 Frost Dates
Frost dates for Caledonia, IL, ZIP 61011
Around 05/01 is the usual last spring frost, about 246 days away. The first fall frost typically arrives around 10/12, about 162 frost-free days later.
Zone 5b (-15 to -10°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 Caledonia, not a forecast for this year.
What to do before the first frost
Zone 5b around Caledonia has about 6 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 05/01 isn't a guarantee
05/01 is the middle of 30 years of NOAA records, not a promise. Plant by 04/17 and you're betting against frost in roughly 9 years out of 10. 05/16 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Caledonia compares
Caledonia's growing season runs about 162 days, ranking 31,880 of 40,283 US ZIP codes measured here, longest to shortest. Within IL, it ranks 1,539 of 1,548.
Learn more
local microclimates explains what one yard in Caledonia can differ from the 61011 normal, and zone vs. frost date explains why Zone 5b and Caledonia's frost date answer different questions.