St. Peters, MO 63376 Frost Dates
Frost dates for St. Peters, MO, ZIP 63376
Around 04/09 is the usual last spring frost, about 224 days away. The first fall frost typically arrives around 10/26, about 198 frost-free days later.
Zone 6b (-5 to 0°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 St. Peters, not a forecast for this year.
What to do before the first frost
Zone 6b around St. Peters has about 8 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 04/09 isn't a guarantee
04/09 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 St. Peters compares
At roughly 198 frost-free days, St. Peters places 18,265 of 40,283 ZIP codes in this dataset. Within MO, it ranks 472 of 1,129.
Learn more
local microclimates explains what one yard in St. Peters can differ from the 63376 normal, and zone vs. frost date explains why Zone 6b and St. Peters's frost date answer different questions.