Ballwin, MO 63011 Frost Dates
When can you plant in Ballwin, MO?
Around 04/04 is the usual last spring frost, about 219 days away. The first fall frost typically arrives around 10/29, about 206 frost-free days later.
The USDA Plant Hardiness Zone Map puts Ballwin in Zone 7a (0 to 5°F average annual minimum); frost dates are NOAA's 1991-2020 station normal, not this year's forecast.
What to do before the first frost
About 9 weeks of growing season left in Ballwin before the first fall frost — a cold frame or row cover can stretch harvest weeks past that date.
The actual range around Ballwin's last frost
04/04 is the middle of 30 years of NOAA records, not a promise. Plant by 03/20 and you're betting against frost in roughly 9 years out of 10. 04/21 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Ballwin compares
About 206 days separate Ballwin's last and first frost, putting it 15,954 of 40,283 ZIP codes nationally. Within MO, it ranks 221 of 1,129.
Learn more
the frost range covers how to read the range around Ballwin's dates instead of trusting one. local microclimates covers what one yard in Ballwin can differ from the 63011 normal.