Greenville, IL 62246 Frost Dates
When can you plant in Greenville, IL?
Around 04/06 is the usual last spring frost, about 221 days away. The first fall frost typically arrives around 10/29, about 204 frost-free days later.
The USDA Plant Hardiness Zone Map puts Greenville in Zone 6b (-5 to 0°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 9 weeks of growing season left in Greenville 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
04/06 is the middle of 30 years of NOAA records, not a promise. Plant by 03/23 and you're betting against frost in roughly 9 years out of 10. 04/22 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Greenville compares
At roughly 204 frost-free days, Greenville places 16,559 of 40,283 ZIP codes in this dataset. Within IL, it ranks 124 of 1,548.
Learn more
local microclimates covers what one yard in Greenville can differ from the 62246 normal. zone vs. frost date covers why Zone 6b and Greenville's frost date answer different questions.