Calamus, IA 52729 Frost Dates
52729, near Calamus, IA: the frost window
The last spring frost here typically falls around 04/27, about 242 days from today. Fall's first freeze usually shows up around 10/10, roughly 165 days after the last spring frost.
The USDA Plant Hardiness Zone Map puts Calamus in Zone 5b (-15 to -10°F average annual minimum); frost dates are NOAA's 1991-2020 station normal, not this year's forecast.
Stretching the season past the first frost
Calamus'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 Calamus's last frost
04/27 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/11 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/13 and only about 1 year in 10 sees frost after that.
Calamus against the rest of the dataset
About 165 days separate Calamus's last and first frost, putting it 30,725 of 40,283 ZIP codes nationally. Within IA, it ranks 542 of 1,042.
Learn more
Two guides worth reading on 52729: local microclimates, on what one yard in Calamus can differ from the 52729 normal, and zone vs. frost date, on why Zone 5b and Calamus's frost date answer different questions.