Searsboro, IA 50242 Frost Dates
50242, near Searsboro, IA: the frost window
The last spring frost here typically falls around 05/03, about 248 days from today. Fall's first freeze usually shows up around 10/06, roughly 155 days after the last spring frost.
Zone 5b (-15 to -10°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 Searsboro, not a forecast for this year.
Stretching the season past the first frost
Searsboro'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.
Why 05/03 isn't a guarantee
05/03 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/19 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.
Searsboro against the rest of the dataset
At roughly 155 frost-free days, Searsboro places 34,175 of 40,283 ZIP codes in this dataset. Within IA, it ranks 887 of 1,042.
Learn more
Two guides worth reading on 50242: local microclimates, on what one yard in Searsboro can differ from the 50242 normal, and zone vs. frost date, on why Zone 5b and Searsboro's frost date answer different questions.