LaSalle, IL 61301 Frost Dates
Frost dates for LaSalle, IL, ZIP 61301
Typically, the last spring freeze lands around 04/24, roughly 239 days out. The first fall frost typically arrives around 10/18, about 176 frost-free days later.
The USDA Plant Hardiness Zone Map puts LaSalle in Zone 5b (-15 to -10°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 5b around LaSalle has about 7 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.
Why 04/24 isn't a guarantee
04/24 is the middle of 30 years of NOAA records, not a promise. Plant by 04/11 and you're betting against frost in roughly 9 years out of 10. 05/08 is the safer bet, historically only a 1-in-10 chance of frost that late.
How LaSalle compares
LaSalle's growing season runs about 176 days, ranking 26,409 of 40,283 US ZIP codes measured here, longest to shortest. Within IL, it ranks 1,164 of 1,548.
Learn more
zone vs. frost date explains why Zone 5b and LaSalle's frost date answer different questions, and the frost range explains how to read the range around LaSalle's dates instead of trusting one.