Thebes, IL 62990 Frost Dates
When can you plant in Thebes, IL?
The last spring frost here typically falls around 04/05, about 220 days from today. The first fall frost typically arrives around 10/25, about 201 frost-free days later.
Thebes sits in USDA Zone 7a (0 to 5°F average annual minimum). The dates above are NOAA's 1991-2020 normal at the nearest reporting station, a 30-year average, not a forecast.
What to do before the first frost
About 8 weeks of growing season left in Thebes before the first fall frost — a cold frame or row cover can stretch harvest weeks past that date.
Why 04/05 isn't a guarantee
04/05 is the middle of 30 years of NOAA records, not a promise. Plant by 03/19 and you're betting against frost in roughly 9 years out of 10. 04/21 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Thebes compares
Thebes's growing season runs about 201 days, ranking 17,668 of 40,283 US ZIP codes measured here, longest to shortest. Within IL, it ranks 265 of 1,548.
Learn more
the frost range covers how to read the range around Thebes's dates instead of trusting one. local microclimates covers what one yard in Thebes can differ from the 62990 normal.