Primghar, IA 51245 Frost Dates
Primghar, IA: when does the frost end?
The last spring frost here typically falls around 04/29, about 244 days from today. Fall's first freeze usually shows up around 10/10, roughly 163 days after the last spring frost.
Primghar 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 Primghar'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
04/29 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.
Primghar against the rest of the dataset
About 163 days separate Primghar's last and first frost, putting it 31,473 of 40,283 ZIP codes nationally. Within IA, it ranks 671 of 1,042.
Learn more
Before leaning on 51245's figures: local microclimates explains what one yard in Primghar can differ from the 51245 normal, while zone vs. frost date explains why Zone 5a and Primghar's frost date answer different questions.