Ayrshire, IA 50515 Frost Dates
Ayrshire, IA: when does the frost end?
Typically, the last spring freeze lands around 04/27, roughly 242 days out. Fall's first freeze usually shows up around 10/07, roughly 164 days after the last spring frost.
The USDA Plant Hardiness Zone Map puts Ayrshire 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
With roughly 6 weeks until Ayrshire's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
The actual range around Ayrshire'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 05/09 and only about 1 year in 10 sees frost after that.
Ayrshire against the rest of the dataset
At roughly 164 frost-free days, Ayrshire places 31,235 of 40,283 ZIP codes in this dataset. Within IA, it ranks 647 of 1,042.
Learn more
Before leaning on 50515's figures: the frost range explains how to read the range around Ayrshire's dates instead of trusting one, while local microclimates explains what one yard in Ayrshire can differ from the 50515 normal.