Formoso, KS 66942 Frost Dates
When can you plant in Formoso, KS?
Typically, the last spring freeze lands around 04/20, roughly 235 days out. The first fall frost typically arrives around 10/19, about 181 frost-free days later.
Formoso sits in USDA Zone 6a (-10 to -5°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.
What to do before the first frost
About 7 weeks of growing season left in Formoso before the first fall frost — a cold frame or row cover can stretch harvest weeks past that date.
The actual range around Formoso's last frost
04/20 is the middle of 30 years of NOAA records, not a promise. Plant by 04/05 and you're betting against frost in roughly 9 years out of 10. 05/03 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Formoso compares
About 181 days separate Formoso's last and first frost, putting it 24,742 of 40,283 ZIP codes nationally. Within KS, it ranks 498 of 745.
Learn more
zone vs. frost date covers why Zone 6a and Formoso's frost date answer different questions. the frost range covers how to read the range around Formoso's dates instead of trusting one.