Osceola, IA 50213 Frost Dates
Osceola, IA: when does the frost end?
Around 04/23 is the usual last spring frost, about 238 days away. Fall's first freeze usually shows up around 10/17, roughly 176 days after the last spring frost.
The USDA Plant Hardiness Zone Map puts Osceola in Zone 5b (-15 to -10°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 7 weeks until Osceola'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
04/23 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.
Osceola against the rest of the dataset
About 176 days separate Osceola's last and first frost, putting it 26,432 of 40,283 ZIP codes nationally. Within IA, it ranks 143 of 1,042.
Learn more
Before leaning on 50213's figures: zone vs. frost date explains why Zone 5b and Osceola's frost date answer different questions, while the frost range explains how to read the range around Osceola's dates instead of trusting one.