Granville, IL 61326 Frost Dates
Granville, IL: when does the frost end?
The last spring frost here typically falls around 04/24, about 239 days from today. Fall's first freeze usually shows up around 10/17, roughly 174 days after the last spring frost.
Zone 5b (-15 to -10°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 Granville, not a forecast for this year.
Stretching the season past the first frost
With roughly 7 weeks until Granville's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
How much risk comes with planting early here
04/24 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/11 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/10 and only about 1 year in 10 sees frost after that.
Granville against the rest of the dataset
Granville's growing season runs about 174 days, ranking 27,537 of 40,283 US ZIP codes measured here, longest to shortest. Within IL, it ranks 1,252 of 1,548.
Learn more
Before leaning on 61326's figures: local microclimates explains what one yard in Granville can differ from the 61326 normal, while zone vs. frost date explains why Zone 5b and Granville's frost date answer different questions.