St. Louis, MO 63108 Frost Dates
Frost dates for St. Louis, MO, ZIP 63108
The last spring frost here typically falls around 04/01, about 216 days from today. The first fall frost typically arrives around 11/04, about 218 frost-free days later.
Zone 7a (0 to 5°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 St. Louis, not a forecast for this year.
What to do before the first frost
Zone 7a around St. Louis has about 10 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 04/01 isn't a guarantee
04/01 is the middle of 30 years of NOAA records, not a promise. Plant by 03/14 and you're betting against frost in roughly 9 years out of 10. 04/18 is the safer bet, historically only a 1-in-10 chance of frost that late.
How St. Louis compares
St. Louis's growing season runs about 218 days, ranking 13,146 of 40,283 US ZIP codes measured here, longest to shortest. Within MO, it ranks 50 of 1,129.
Learn more
the frost range explains how to read the range around St. Louis's dates instead of trusting one, and local microclimates explains what one yard in St. Louis can differ from the 63108 normal.