Latham, IL 62543 Frost Dates
Frost dates for Latham, IL, ZIP 62543
The last spring frost here typically falls around 04/14, about 229 days from today. The first fall frost typically arrives around 10/24, about 192 frost-free days later.
Latham sits in USDA Zone 6a (-10 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 6a around Latham 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 Latham's last frost
04/14 is the middle of 30 years of NOAA records, not a promise. Plant by 04/01 and you're betting against frost in roughly 9 years out of 10. 05/01 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Latham compares
Latham's growing season runs about 192 days, ranking 20,551 of 40,283 US ZIP codes measured here, longest to shortest. Within IL, it ranks 436 of 1,548.
Learn more
local microclimates explains what one yard in Latham can differ from the 62543 normal, and zone vs. frost date explains why Zone 6a and Latham's frost date answer different questions.