Keithsburg, IL 61442 Frost Dates
When can you plant in Keithsburg, IL?
Around 04/14 is the usual last spring frost, about 229 days away. The first fall frost typically arrives around 10/24, about 190 frost-free days later.
The USDA Plant Hardiness Zone Map puts Keithsburg 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
About 8 weeks of growing season left in Keithsburg before the first fall frost — a cold frame or row cover can stretch harvest weeks past that date.
Why 04/14 isn't a guarantee
04/14 is the middle of 30 years of NOAA records, not a promise. Plant by 04/01 and you're betting against frost in roughly 9 years out of 10. 05/02 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Keithsburg compares
At roughly 190 frost-free days, Keithsburg places 21,273 of 40,283 ZIP codes in this dataset. Within IL, it ranks 533 of 1,548.
Learn more
zone vs. frost date covers why Zone 5b and Keithsburg's frost date answer different questions. the frost range covers how to read the range around Keithsburg's dates instead of trusting one.