Marthasville, MO 63357 Frost Dates
Frost dates for Marthasville, MO, ZIP 63357
The last spring frost here typically falls around 04/08, about 223 days from today. The first fall frost typically arrives around 10/25, about 199 frost-free days later.
Marthasville sits in USDA Zone 6b (-5 to 0°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 6b around Marthasville 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 04/08 isn't a guarantee
04/08 is the middle of 30 years of NOAA records, not a promise. Plant by 03/24 and you're betting against frost in roughly 9 years out of 10. 04/22 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Marthasville compares
About 199 days separate Marthasville's last and first frost, putting it 18,151 of 40,283 ZIP codes nationally. Within MO, it ranks 436 of 1,129.
Learn more
zone vs. frost date explains why Zone 6b and Marthasville's frost date answer different questions, and the frost range explains how to read the range around Marthasville's dates instead of trusting one.