Denison, KS 66419 Frost Dates
When can you plant in Denison, KS?
Typically, the last spring freeze lands around 04/10, roughly 225 days out. The first fall frost typically arrives around 10/29, about 199 frost-free days later.
Zone 6a (-10 to -5°F average annual minimum) comes from the USDA Plant Hardiness Zone Map; the frost dates above are the 1991-2020 normal at the nearest reporting NOAA station for Denison, not a forecast for this year.
What to do before the first frost
About 9 weeks of growing season left in Denison before the first fall frost — a cold frame or row cover can stretch harvest weeks past that date.
Why 04/10 isn't a guarantee
04/10 is the middle of 30 years of NOAA records, not a promise. Plant by 03/27 and you're betting against frost in roughly 9 years out of 10. 04/25 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Denison compares
At roughly 199 frost-free days, Denison places 18,229 of 40,283 ZIP codes in this dataset. Within KS, it ranks 167 of 745.
Learn more
zone vs. frost date covers why Zone 6a and Denison's frost date answer different questions. the frost range covers how to read the range around Denison's dates instead of trusting one.