Chattanooga, TN 37406 Frost Dates
37406, near Chattanooga, TN: the frost window
The last spring frost here typically falls around 03/24, about 208 days from today. Fall's first freeze usually shows up around 11/09, roughly 230 days after the last spring frost.
Zone 8a (10 to 15°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 Chattanooga, not a forecast for this year.
Stretching the season past the first frost
Chattanooga's growing season runs out in roughly 10 weeks — a cold frame or greenhouse kit is the usual way to keep cool-weather crops going past the first frost.
The actual range around Chattanooga's last frost
03/24 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 03/06 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 04/08 and only about 1 year in 10 sees frost after that.
Chattanooga against the rest of the dataset
At roughly 230 frost-free days, Chattanooga places 10,294 of 40,283 ZIP codes in this dataset. Within TN, it ranks 53 of 770.
Learn more
Two guides worth reading on 37406: local microclimates, on what one yard in Chattanooga can differ from the 37406 normal, and zone vs. frost date, on why Zone 8a and Chattanooga's frost date answer different questions.