Renwick, IA 50577 Frost Dates
Renwick, IA: when does the frost end?
Typically, the last spring freeze lands around 04/26, roughly 241 days out. Fall's first freeze usually shows up around 10/12, roughly 169 days after the last spring frost.
The USDA Plant Hardiness Zone Map puts Renwick 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 Renwick'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
04/26 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 05/07 and only about 1 year in 10 sees frost after that.
Renwick against the rest of the dataset
At roughly 169 frost-free days, Renwick places 29,602 of 40,283 ZIP codes in this dataset. Within IA, it ranks 353 of 1,042.
Learn more
Before leaning on 50577's figures: local microclimates explains what one yard in Renwick can differ from the 50577 normal, while zone vs. frost date explains why Zone 5a and Renwick's frost date answer different questions.