Kirwin, KS 67644 Frost Dates
Kirwin, KS: when does the frost end?
Around 04/30 is the usual last spring frost, about 245 days away. Fall's first freeze usually shows up around 10/07, roughly 159 days after the last spring frost.
The USDA Plant Hardiness Zone Map puts Kirwin in Zone 6a (-10 to -5°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 Kirwin's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
Why 04/30 isn't a guarantee
04/30 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/18 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.
Kirwin against the rest of the dataset
At roughly 159 frost-free days, Kirwin places 32,799 of 40,283 ZIP codes in this dataset. Within KS, it ranks 733 of 745.
Learn more
Before leaning on 67644's figures: local microclimates explains what one yard in Kirwin can differ from the 67644 normal, while zone vs. frost date explains why Zone 6a and Kirwin's frost date answer different questions.