Rowley, IA 52329 Frost Dates
Rowley, 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 10/07, roughly 159 days after the last spring frost.
Rowley sits in USDA Zone 5a (-20 to -15°F average annual minimum). The dates above are NOAA's 1991-2020 normal at the nearest reporting station, a 30-year average, not a forecast.
Stretching the season past the first frost
With roughly 6 weeks until Rowley'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 04/16 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/12 and only about 1 year in 10 sees frost after that.
Rowley against the rest of the dataset
Rowley's growing season runs about 159 days, ranking 32,765 of 40,283 US ZIP codes measured here, longest to shortest. Within IA, it ranks 800 of 1,042.
Learn more
Before leaning on 52329's figures: local microclimates explains what one yard in Rowley can differ from the 52329 normal, while zone vs. frost date explains why Zone 5a and Rowley's frost date answer different questions.