Lake Bluff, IL 60075 Frost Dates
When can you plant in Lake Bluff, IL?
Typically, the last spring freeze lands around 04/30, roughly 245 days out. The first fall frost typically arrives around 10/19, about 170 frost-free days later.
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 Lake Bluff, not a forecast for this year.
What to do before the first frost
About 7 weeks of growing season left in Lake Bluff 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
04/30 is the middle of 30 years of NOAA records, not a promise. Plant by 04/15 and you're betting against frost in roughly 9 years out of 10. 05/14 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Lake Bluff compares
At roughly 170 frost-free days, Lake Bluff places 28,982 of 40,283 ZIP codes in this dataset. Within IL, it ranks 1,394 of 1,548.
Learn more
local microclimates covers what one yard in Lake Bluff can differ from the 60075 normal. zone vs. frost date covers why Zone 5b and Lake Bluff's frost date answer different questions.