Mount Prospect, IL 60056 Frost Dates
Frost dates for Mount Prospect, IL, ZIP 60056
Around 04/19 is the usual last spring frost, about 234 days away. The first fall frost typically arrives around 10/26, about 190 frost-free days later.
Mount Prospect 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 Mount Prospect 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
04/19 is the middle of 30 years of NOAA records, not a promise. Plant by 04/04 and you're betting against frost in roughly 9 years out of 10. 05/03 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Mount Prospect compares
About 190 days separate Mount Prospect's last and first frost, putting it 21,013 of 40,283 ZIP codes nationally. Within IL, it ranks 492 of 1,548.
Learn more
the frost range explains how to read the range around Mount Prospect's dates instead of trusting one, and local microclimates explains what one yard in Mount Prospect can differ from the 60056 normal.