Winchester, MO 63021 Frost Dates
Frost dates for Winchester, MO, ZIP 63021
The last spring frost here typically falls around 04/04, about 219 days from today. The first fall frost typically arrives around 10/29, about 206 frost-free days later.
Zone 7a (0 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 Winchester, not a forecast for this year.
What to do before the first frost
Zone 7a around Winchester has about 9 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.
Why 04/04 isn't a guarantee
04/04 is the middle of 30 years of NOAA records, not a promise. Plant by 03/20 and you're betting against frost in roughly 9 years out of 10. 04/21 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Winchester compares
At roughly 206 frost-free days, Winchester places 16,051 of 40,283 ZIP codes in this dataset. Within MO, it ranks 231 of 1,129.
Learn more
local microclimates explains what one yard in Winchester can differ from the 63021 normal, and zone vs. frost date explains why Zone 7a and Winchester's frost date answer different questions.