Greenfield, IL 62044 Frost Dates
When can you plant in Greenfield, IL?
The last spring frost here typically falls around 04/13, about 228 days from today. The first fall frost typically arrives around 10/22, about 190 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 Greenfield, not a forecast for this year.
What to do before the first frost
About 8 weeks of growing season left in Greenfield before the first fall frost — a cold frame or row cover can stretch harvest weeks past that date.
The actual range around Greenfield's last frost
04/13 is the middle of 30 years of NOAA records, not a promise. Plant by 03/30 and you're betting against frost in roughly 9 years out of 10. 04/28 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Greenfield compares
Greenfield's growing season runs about 190 days, ranking 21,234 of 40,283 US ZIP codes measured here, longest to shortest. Within IL, it ranks 520 of 1,548.
Learn more
zone vs. frost date covers why Zone 6a and Greenfield's frost date answer different questions. the frost range covers how to read the range around Greenfield's dates instead of trusting one.