Princeton, MO 64673 Frost Dates
Frost dates for Princeton, MO, ZIP 64673
Around 04/25 is the usual last spring frost, about 240 days away. The first fall frost typically arrives around 10/15, about 174 frost-free days later.
Zone 5b (-15 to -10°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 Princeton, not a forecast for this year.
What to do before the first frost
Zone 5b around Princeton 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.
Why 04/25 isn't a guarantee
04/25 is the middle of 30 years of NOAA records, not a promise. Plant by 04/11 and you're betting against frost in roughly 9 years out of 10. 05/08 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Princeton compares
About 174 days separate Princeton's last and first frost, putting it 27,554 of 40,283 ZIP codes nationally. Within MO, it ranks 1,086 of 1,129.
Learn more
local microclimates explains what one yard in Princeton can differ from the 64673 normal, and zone vs. frost date explains why Zone 5b and Princeton's frost date answer different questions.