Hayti, MO 63840 Frost Dates
Frost dates for Hayti, MO, ZIP 63840
Typically, the last spring freeze lands around 03/24, roughly 208 days out. The first fall frost typically arrives around 11/09, about 230 frost-free days later.
Hayti sits in USDA Zone 7b (5 to 10°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
Zone 7b around Hayti has about 10 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 Hayti's last frost
03/24 is the middle of 30 years of NOAA records, not a promise. Plant by 03/07 and you're betting against frost in roughly 9 years out of 10. 04/08 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Hayti compares
Hayti's growing season runs about 230 days, ranking 10,416 of 40,283 US ZIP codes measured here, longest to shortest. Within MO, it ranks 3 of 1,129.
Learn more
local microclimates explains what one yard in Hayti can differ from the 63840 normal, and zone vs. frost date explains why Zone 7b and Hayti's frost date answer different questions.