Maryville, IL 62062 Frost Dates
When can you plant in Maryville, IL?
Around 04/04 is the usual last spring frost, about 219 days away. The first fall frost typically arrives around 11/05, about 214 frost-free days later.
The USDA Plant Hardiness Zone Map puts Maryville in Zone 7a (0 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
About 10 weeks of growing season left in Maryville before the first fall frost — a cold frame or row cover can stretch harvest weeks past that date.
Why 04/04 isn't a guarantee
04/04 is the middle of 30 years of NOAA records, not a promise. Plant by 03/18 and you're betting against frost in roughly 9 years out of 10. 04/19 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Maryville compares
About 214 days separate Maryville's last and first frost, putting it 14,244 of 40,283 ZIP codes nationally. Within IL, it ranks 18 of 1,548.
Learn more
zone vs. frost date covers why Zone 7a and Maryville's frost date answer different questions. the frost range covers how to read the range around Maryville's dates instead of trusting one.