Grand Tower, IL 62942 Frost Dates
Frost dates for Grand Tower, IL, ZIP 62942
The last spring frost here typically falls around 04/09, about 224 days from today. The first fall frost typically arrives around 10/22, about 195 frost-free days later.
Grand Tower 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
Zone 7a around Grand Tower has about 8 weeks left before the first fall frost — that's the usual window to get a cold frame up if you want to keep harvesting past it.
The actual range around Grand Tower's last frost
04/09 is the middle of 30 years of NOAA records, not a promise. Plant by 03/24 and you're betting against frost in roughly 9 years out of 10. 04/25 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Grand Tower compares
Grand Tower's growing season runs about 195 days, ranking 19,335 of 40,283 US ZIP codes measured here, longest to shortest. Within IL, it ranks 348 of 1,548.
Learn more
the frost range explains how to read the range around Grand Tower's dates instead of trusting one, and local microclimates explains what one yard in Grand Tower can differ from the 62942 normal.