Guttenberg, IA 52052 Frost Dates
52052, near Guttenberg, IA: the frost window
Around 04/21 is the usual last spring frost, about 236 days away. Fall's first freeze usually shows up around 10/18, roughly 178 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 Guttenberg, not a forecast for this year.
Stretching the season past the first frost
Guttenberg's growing season runs out in roughly 7 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 Guttenberg's last frost
04/21 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/07 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/06 and only about 1 year in 10 sees frost after that.
Guttenberg against the rest of the dataset
About 178 days separate Guttenberg's last and first frost, putting it 25,763 of 40,283 ZIP codes nationally. Within IA, it ranks 112 of 1,042.
Learn more
Two guides worth reading on 52052: local microclimates, on what one yard in Guttenberg can differ from the 52052 normal, and zone vs. frost date, on why Zone 5a and Guttenberg's frost date answer different questions.