Nora Springs, IA 50458 Frost Dates
50458, near Nora Springs, IA: the frost window
Around 04/30 is the usual last spring frost, about 245 days away. Fall's first freeze usually shows up around 10/09, roughly 163 days after the last spring frost.
Nora Springs 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
Nora Springs's growing season runs out in roughly 6 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 Nora Springs's last frost
04/30 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/14 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.
Nora Springs against the rest of the dataset
At roughly 163 frost-free days, Nora Springs places 31,438 of 40,283 ZIP codes in this dataset. Within IA, it ranks 665 of 1,042.
Learn more
Two guides worth reading on 50458: zone vs. frost date, on why Zone 5a and Nora Springs's frost date answer different questions, and the frost range, on how to read the range around Nora Springs's dates instead of trusting one.