Clarksville, IA 50619 Frost Dates
Clarksville, IA: when does the frost end?
Typically, the last spring freeze lands around 04/30, roughly 245 days out. Fall's first freeze usually shows up around 10/06, roughly 157 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 Clarksville, not a forecast for this year.
Stretching the season past the first frost
With roughly 6 weeks until Clarksville's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
How much risk comes with planting early here
04/30 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/15 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/14 and only about 1 year in 10 sees frost after that.
Clarksville against the rest of the dataset
Clarksville's growing season runs about 157 days, ranking 33,370 of 40,283 US ZIP codes measured here, longest to shortest. Within IA, it ranks 837 of 1,042.
Learn more
Before leaning on 50619's figures: zone vs. frost date explains why Zone 5a and Clarksville's frost date answer different questions, while the frost range explains how to read the range around Clarksville's dates instead of trusting one.