Herculaneum, MO 63048 Frost Dates
When can you plant in Herculaneum, MO?
Typically, the last spring freeze lands around 04/09, roughly 224 days out. The first fall frost typically arrives around 10/26, about 197 frost-free days later.
Herculaneum sits in USDA Zone 7a (0 to 5°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
About 8 weeks of growing season left in Herculaneum before the first fall frost — a cold frame or row cover can stretch harvest weeks past that date.
The actual range around Herculaneum's last frost
04/09 is the middle of 30 years of NOAA records, not a promise. Plant by 03/25 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 Herculaneum compares
About 197 days separate Herculaneum's last and first frost, putting it 18,665 of 40,283 ZIP codes nationally. Within MO, it ranks 539 of 1,129.
Learn more
local microclimates covers what one yard in Herculaneum can differ from the 63048 normal. zone vs. frost date covers why Zone 7a and Herculaneum's frost date answer different questions.