Colesburg, IA 52035 Frost Dates
Colesburg, IA: when does the frost end?
Typically, the last spring freeze lands around 04/21, roughly 236 days out. Fall's first freeze usually shows up around 10/18, roughly 178 days after the last spring frost.
Colesburg sits in USDA Zone 5a (-20 to -15°F average annual minimum). The dates above are NOAA's 1991-2020 normal at the nearest reporting station, a 30-year average, not a forecast.
Stretching the season past the first frost
With roughly 7 weeks until Colesburg's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
Why 04/21 isn't a guarantee
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.
Colesburg against the rest of the dataset
About 178 days separate Colesburg's last and first frost, putting it 25,889 of 40,283 ZIP codes nationally. Within IA, it ranks 119 of 1,042.
Learn more
Before leaning on 52035's figures: local microclimates explains what one yard in Colesburg can differ from the 52035 normal, while zone vs. frost date explains why Zone 5a and Colesburg's frost date answer different questions.