Neponset, IL 61345 Frost Dates
When can you plant in Neponset, IL?
Around 04/24 is the usual last spring frost, about 239 days away. The first fall frost typically arrives around 10/17, about 175 frost-free days later.
The USDA Plant Hardiness Zone Map puts Neponset 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 7 weeks of growing season left in Neponset before the first fall frost — a cold frame or row cover can stretch harvest weeks past that date.
How much risk comes with planting early here
04/24 is the middle of 30 years of NOAA records, not a promise. Plant by 04/10 and you're betting against frost in roughly 9 years out of 10. 05/08 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Neponset compares
About 175 days separate Neponset's last and first frost, putting it 27,194 of 40,283 ZIP codes nationally. Within IL, it ranks 1,214 of 1,548.
Learn more
zone vs. frost date covers why Zone 5b and Neponset's frost date answer different questions. the frost range covers how to read the range around Neponset's dates instead of trusting one.