Smithville, MO 64089 Frost Dates
When can you plant in Smithville, MO?
Around 04/18 is the usual last spring frost, about 233 days away. The first fall frost typically arrives around 10/20, about 183 frost-free days later.
Smithville sits in USDA Zone 6a (-10 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 Smithville before the first fall frost — a cold frame or row cover can stretch harvest weeks past that date.
Why 04/18 isn't a guarantee
04/18 is the middle of 30 years of NOAA records, not a promise. Plant by 04/04 and you're betting against frost in roughly 9 years out of 10. 05/03 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Smithville compares
About 183 days separate Smithville's last and first frost, putting it 23,806 of 40,283 ZIP codes nationally. Within MO, it ranks 957 of 1,129.
Learn more
local microclimates covers what one yard in Smithville can differ from the 64089 normal. zone vs. frost date covers why Zone 6a and Smithville's frost date answer different questions.