State Center, IA 50247 Frost Dates
State Center, IA: when does the frost end?
Around 04/24 is the usual last spring frost, about 239 days away. Fall's first freeze usually shows up around 10/12, roughly 170 days after the last spring frost.
State Center sits in USDA Zone 5a (-20 to -15°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 6 weeks until State Center's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
The actual range around State Center's last frost
04/24 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/09 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/07 and only about 1 year in 10 sees frost after that.
State Center against the rest of the dataset
About 170 days separate State Center's last and first frost, putting it 29,088 of 40,283 ZIP codes nationally. Within IA, it ranks 302 of 1,042.
Learn more
Before leaning on 50247's figures: zone vs. frost date explains why Zone 5a and State Center's frost date answer different questions, while the frost range explains how to read the range around State Center's dates instead of trusting one.