Oregon, IL 61061 Frost Dates
61061, near Oregon, IL: the frost window
Around 04/26 is the usual last spring frost, about 241 days away. Fall's first freeze usually shows up around 10/13, roughly 168 days after the last spring frost.
Oregon 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.
Stretching the season past the first frost
Oregon's growing season runs out in roughly 7 weeks — a cold frame or greenhouse kit is the usual way to keep cool-weather crops going past the first frost.
The actual range around Oregon's last frost
04/26 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 05/12 and only about 1 year in 10 sees frost after that.
Oregon against the rest of the dataset
Oregon's growing season runs about 168 days, ranking 29,709 of 40,283 US ZIP codes measured here, longest to shortest. Within IL, it ranks 1,442 of 1,548.
Learn more
Two guides worth reading on 61061: the frost range, on how to read the range around Oregon's dates instead of trusting one, and local microclimates, on what one yard in Oregon can differ from the 61061 normal.