Lockport, IL 60441 Frost Dates
Frost dates for Lockport, IL, ZIP 60441
Around 04/20 is the usual last spring frost, about 235 days away. The first fall frost typically arrives around 10/22, about 184 frost-free days later.
The USDA Plant Hardiness Zone Map puts Lockport in Zone 6a (-10 to -5°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
Zone 6a around Lockport 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 Lockport's last frost
04/20 is the middle of 30 years of NOAA records, not a promise. Plant by 04/07 and you're betting against frost in roughly 9 years out of 10. 05/06 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Lockport compares
About 184 days separate Lockport's last and first frost, putting it 23,433 of 40,283 ZIP codes nationally. Within IL, it ranks 868 of 1,548.
Learn more
zone vs. frost date explains why Zone 6a and Lockport's frost date answer different questions, and the frost range explains how to read the range around Lockport's dates instead of trusting one.