Silvis, IL 61244 Frost Dates
When can you plant in Silvis, IL?
Typically, the last spring freeze lands around 04/24, roughly 239 days out. The first fall frost typically arrives around 10/18, about 176 frost-free days later.
Silvis 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 7 weeks of growing season left in Silvis 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 04/09 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 Silvis compares
About 176 days separate Silvis's last and first frost, putting it 26,419 of 40,283 ZIP codes nationally. Within IL, it ranks 1,167 of 1,548.
Learn more
local microclimates covers what one yard in Silvis can differ from the 61244 normal. zone vs. frost date covers why Zone 5b and Silvis's frost date answer different questions.