St. Louis, OK 74866 Frost Dates
St. Louis, OK: when does the frost end?
The last spring frost here typically falls around 04/02, about 217 days from today. Fall's first freeze usually shows up around 11/04, roughly 217 days after the last spring frost.
Zone 7b (5 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 St. Louis, not a forecast for this year.
Stretching the season past the first frost
With roughly 10 weeks until St. Louis's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
Why 04/02 isn't a guarantee
04/02 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 03/14 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 04/18 and only about 1 year in 10 sees frost after that.
St. Louis against the rest of the dataset
At roughly 217 frost-free days, St. Louis places 13,626 of 40,283 ZIP codes in this dataset. Within OK, it ranks 271 of 764.
Learn more
Before leaning on 74866's figures: the frost range explains how to read the range around St. Louis's dates instead of trusting one, while local microclimates explains what one yard in St. Louis can differ from the 74866 normal.