Dolliver, IA 50531 Frost Dates
Dolliver, IA: when does the frost end?
Around 05/02 is the usual last spring frost, about 247 days away. Fall's first freeze usually shows up around 10/03, roughly 153 days after the last spring frost.
The USDA Plant Hardiness Zone Map puts Dolliver 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 5 weeks until Dolliver's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
The actual range around Dolliver's last frost
05/02 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/18 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.
Dolliver against the rest of the dataset
About 153 days separate Dolliver's last and first frost, putting it 34,662 of 40,283 ZIP codes nationally. Within IA, it ranks 944 of 1,042.
Learn more
Before leaning on 50531's figures: the frost range explains how to read the range around Dolliver's dates instead of trusting one, while local microclimates explains what one yard in Dolliver can differ from the 50531 normal.