Miles, IA 52064 Frost Dates
Miles, IA: when does the frost end?
Around 04/25 is the usual last spring frost, about 240 days away. Fall's first freeze usually shows up around 10/16, roughly 172 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 Miles, not a forecast for this year.
Stretching the season past the first frost
With roughly 7 weeks until Miles's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
Why 04/25 isn't a guarantee
04/25 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/10 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/11 and only about 1 year in 10 sees frost after that.
Miles against the rest of the dataset
At roughly 172 frost-free days, Miles places 28,468 of 40,283 ZIP codes in this dataset. Within IA, it ranks 274 of 1,042.
Learn more
Before leaning on 52064's figures: zone vs. frost date explains why Zone 5a and Miles's frost date answer different questions, while the frost range explains how to read the range around Miles's dates instead of trusting one.