Onaga, KS 66521 Frost Dates
Frost dates for Onaga, KS, ZIP 66521
Around 04/19 is the usual last spring frost, about 234 days away. The first fall frost typically arrives around 10/19, about 182 frost-free days later.
The USDA Plant Hardiness Zone Map puts Onaga in Zone 6a (-10 to -5°F average annual minimum); frost dates are NOAA's 1991-2020 station normal, not this year's forecast.
What to do before the first frost
Zone 6a around Onaga has about 7 weeks left before the first fall frost — that's the usual window to get a cold frame up if you want to keep harvesting past it.
The actual range around Onaga's last frost
04/19 is the middle of 30 years of NOAA records, not a promise. Plant by 04/04 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 Onaga compares
About 182 days separate Onaga's last and first frost, putting it 24,258 of 40,283 ZIP codes nationally. Within KS, it ranks 473 of 745.
Learn more
local microclimates explains what one yard in Onaga can differ from the 66521 normal, and zone vs. frost date explains why Zone 6a and Onaga's frost date answer different questions.