Terril, IA 51364 Frost Dates
Terril, IA: when does the frost end?
Around 04/28 is the usual last spring frost, about 243 days away. Fall's first freeze usually shows up around 10/11, roughly 164 days after the last spring frost.
Terril 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 Terril'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
04/28 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/14 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/09 and only about 1 year in 10 sees frost after that.
Terril against the rest of the dataset
Terril's growing season runs about 164 days, ranking 31,174 of 40,283 US ZIP codes measured here, longest to shortest. Within IA, it ranks 625 of 1,042.
Learn more
Before leaning on 51364's figures: the frost range explains how to read the range around Terril's dates instead of trusting one, while local microclimates explains what one yard in Terril can differ from the 51364 normal.