Kilbourne, IL 62655 Frost Dates
When can you plant in Kilbourne, IL?
Typically, the last spring freeze lands around 04/17, roughly 232 days out. The first fall frost typically arrives around 10/19, about 185 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 Kilbourne, not a forecast for this year.
What to do before the first frost
About 7 weeks of growing season left in Kilbourne before the first fall frost — a cold frame or row cover can stretch harvest weeks past that date.
The actual range around Kilbourne's last frost
04/17 is the middle of 30 years of NOAA records, not a promise. Plant by 04/02 and you're betting against frost in roughly 9 years out of 10. 05/03 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Kilbourne compares
Kilbourne's growing season runs about 185 days, ranking 23,327 of 40,283 US ZIP codes measured here, longest to shortest. Within IL, it ranks 849 of 1,548.
Learn more
local microclimates covers what one yard in Kilbourne can differ from the 62655 normal. zone vs. frost date covers why Zone 6a and Kilbourne's frost date answer different questions.