Corydon, IA 50060 Frost Dates
Corydon, IA: when does the frost end?
The last spring frost here typically falls around 04/21, about 236 days from today. Fall's first freeze usually shows up around 10/19, roughly 178 days after the last spring frost.
Corydon 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
With roughly 7 weeks until Corydon's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
The actual range around Corydon's last frost
04/21 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 05/06 and only about 1 year in 10 sees frost after that.
Corydon against the rest of the dataset
At roughly 178 frost-free days, Corydon places 25,775 of 40,283 ZIP codes in this dataset. Within IA, it ranks 113 of 1,042.
Learn more
Before leaning on 50060's figures: local microclimates explains what one yard in Corydon can differ from the 50060 normal, while zone vs. frost date explains why Zone 5b and Corydon's frost date answer different questions.