Mechanicsburg, IL 62545 Frost Dates
When can you plant in Mechanicsburg, IL?
Typically, the last spring freeze lands around 04/14, roughly 229 days out. The first fall frost typically arrives around 10/20, about 187 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 Mechanicsburg, not a forecast for this year.
What to do before the first frost
About 8 weeks of growing season left in Mechanicsburg before the first fall frost — a cold frame or row cover can stretch harvest weeks past that date.
How much risk comes with planting early here
04/14 is the middle of 30 years of NOAA records, not a promise. Plant by 04/01 and you're betting against frost in roughly 9 years out of 10. 04/29 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Mechanicsburg compares
Mechanicsburg's growing season runs about 187 days, ranking 22,527 of 40,283 US ZIP codes measured here, longest to shortest. Within IL, it ranks 777 of 1,548.
Learn more
local microclimates covers what one yard in Mechanicsburg can differ from the 62545 normal. zone vs. frost date covers why Zone 6a and Mechanicsburg's frost date answer different questions.