Alvan (Alvin), IL 61811 Frost Dates
Alvan (Alvin), IL: when does the frost end?
Typically, the last spring freeze lands around 04/22, roughly 237 days out. Fall's first freeze usually shows up around 10/19, roughly 180 days after the last spring frost.
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 Alvan (Alvin), not a forecast for this year.
Stretching the season past the first frost
With roughly 7 weeks until Alvan (Alvin)'s first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
Why 04/22 isn't a guarantee
04/22 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/07 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/08 and only about 1 year in 10 sees frost after that.
Alvan (Alvin) against the rest of the dataset
Alvan (Alvin)'s growing season runs about 180 days, ranking 25,068 of 40,283 US ZIP codes measured here, longest to shortest. Within IL, it ranks 977 of 1,548.
Learn more
Before leaning on 61811's figures: local microclimates explains what one yard in Alvan (Alvin) can differ from the 61811 normal, while zone vs. frost date explains why Zone 6a and Alvan (Alvin)'s frost date answer different questions.