Round Lake Heights, IL 60073 Frost Dates
When can you plant in Round Lake Heights, IL?
Around 04/24 is the usual last spring frost, about 239 days away. The first fall frost typically arrives around 10/23, about 180 frost-free days later.
Round Lake Heights sits in USDA Zone 5b (-15 to -10°F average annual minimum). The dates above are NOAA's 1991-2020 normal at the nearest reporting station, a 30-year average, not a forecast.
What to do before the first frost
About 8 weeks of growing season left in Round Lake Heights 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
04/24 is the middle of 30 years of NOAA records, not a promise. Plant by 04/11 and you're betting against frost in roughly 9 years out of 10. 05/09 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Round Lake Heights compares
About 180 days separate Round Lake Heights's last and first frost, putting it 24,878 of 40,283 ZIP codes nationally. Within IL, it ranks 961 of 1,548.
Learn more
local microclimates covers what one yard in Round Lake Heights can differ from the 60073 normal. zone vs. frost date covers why Zone 5b and Round Lake Heights's frost date answer different questions.