Sidney, IL 61877 Frost Dates
Frost dates for Sidney, IL, ZIP 61877
Typically, the last spring freeze lands around 04/20, roughly 235 days out. The first fall frost typically arrives around 10/21, about 182 frost-free days later.
Zone 6a (-10 to -5°F average annual minimum) comes from the USDA Plant Hardiness Zone Map; the frost dates above are the 1991-2020 normal at the nearest reporting NOAA station for Sidney, not a forecast for this year.
What to do before the first frost
Zone 6a around Sidney 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.
How much risk comes with planting early here
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. 05/07 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Sidney compares
About 182 days separate Sidney's last and first frost, putting it 24,215 of 40,283 ZIP codes nationally. Within IL, it ranks 901 of 1,548.
Learn more
zone vs. frost date explains why Zone 6a and Sidney's frost date answer different questions, and the frost range explains how to read the range around Sidney's dates instead of trusting one.