Coon Rapids, IA 50058 Frost Dates
50058, near Coon Rapids, IA: the frost window
Around 05/02 is the usual last spring frost, about 247 days away. Fall's first freeze usually shows up around 10/03, roughly 153 days after the last spring frost.
Zone 5a (-20 to -15°F average annual minimum) comes from the USDA Plant Hardiness Zone Map; the frost dates above are the 1991-2020 normal at the nearest reporting NOAA station for Coon Rapids, not a forecast for this year.
Stretching the season past the first frost
Coon Rapids's growing season runs out in roughly 5 weeks — a cold frame or greenhouse kit is the usual way to keep cool-weather crops going past the first frost.
How much risk comes with planting early here
05/02 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/18 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/17 and only about 1 year in 10 sees frost after that.
Coon Rapids against the rest of the dataset
About 153 days separate Coon Rapids's last and first frost, putting it 34,564 of 40,283 ZIP codes nationally. Within IA, it ranks 921 of 1,042.
Learn more
Two guides worth reading on 50058: zone vs. frost date, on why Zone 5a and Coon Rapids's frost date answer different questions, and the frost range, on how to read the range around Coon Rapids's dates instead of trusting one.