Newhall, IA 52315 Frost Dates
52315, near Newhall, IA: the frost window
Around 04/27 is the usual last spring frost, about 242 days away. Fall's first freeze usually shows up around 10/11, roughly 165 days after the last spring frost.
The USDA Plant Hardiness Zone Map puts Newhall 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
Newhall's growing season runs out in roughly 6 weeks — a cold frame or greenhouse kit is the usual way to keep cool-weather crops going past the first frost.
Why 04/27 isn't a guarantee
04/27 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/13 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/11 and only about 1 year in 10 sees frost after that.
Newhall against the rest of the dataset
Newhall's growing season runs about 165 days, ranking 30,648 of 40,283 US ZIP codes measured here, longest to shortest. Within IA, it ranks 518 of 1,042.
Learn more
Two guides worth reading on 52315: the frost range, on how to read the range around Newhall's dates instead of trusting one, and local microclimates, on what one yard in Newhall can differ from the 52315 normal.