Wadena, IA 52169 Frost Dates
52169, near Wadena, IA: the frost window
Around 05/04 is the usual last spring frost, about 249 days away. Fall's first freeze usually shows up around 10/04, roughly 151 days after the last spring frost.
The USDA Plant Hardiness Zone Map puts Wadena in Zone 5a (-20 to -15°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
Wadena'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.
Why 05/04 isn't a guarantee
05/04 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/20 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.
Wadena against the rest of the dataset
At roughly 151 frost-free days, Wadena places 35,178 of 40,283 ZIP codes in this dataset. Within IA, it ranks 983 of 1,042.
Learn more
Two guides worth reading on 52169: local microclimates, on what one yard in Wadena can differ from the 52169 normal, and zone vs. frost date, on why Zone 5a and Wadena's frost date answer different questions.