Piper City, IL 60959 Frost Dates
Frost dates for Piper City, IL, ZIP 60959
The last spring frost here typically falls around 04/25, about 240 days from today. The first fall frost typically arrives around 10/20, about 175 frost-free days later.
The USDA Plant Hardiness Zone Map puts Piper City 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 Piper City 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
04/25 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. 05/10 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Piper City compares
At roughly 175 frost-free days, Piper City places 27,125 of 40,283 ZIP codes in this dataset. Within IL, it ranks 1,208 of 1,548.
Learn more
local microclimates explains what one yard in Piper City can differ from the 60959 normal, and zone vs. frost date explains why Zone 6a and Piper City's frost date answer different questions.