Altamont, KS 67330 Frost Dates
Altamont, KS: when does the frost end?
Typically, the last spring freeze lands around 04/15, roughly 230 days out. Fall's first freeze usually shows up around 10/24, roughly 192 days after the last spring frost.
The USDA Plant Hardiness Zone Map puts Altamont in Zone 7a (0 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 8 weeks until Altamont's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
Why 04/15 isn't a guarantee
04/15 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 03/30 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 04/30 and only about 1 year in 10 sees frost after that.
Altamont against the rest of the dataset
About 192 days separate Altamont's last and first frost, putting it 20,467 of 40,283 ZIP codes nationally. Within KS, it ranks 255 of 745.
Learn more
Before leaning on 67330's figures: the frost range explains how to read the range around Altamont's dates instead of trusting one, while local microclimates explains what one yard in Altamont can differ from the 67330 normal.