Mountain City, TN 37691 Frost Dates
37691, near Mountain City, TN: the frost window
The last spring frost here typically falls around 04/27, about 242 days from today. Fall's first freeze usually shows up around 10/14, roughly 170 days after the last spring frost.
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 Mountain City, not a forecast for this year.
Stretching the season past the first frost
Mountain City's growing season runs out in roughly 7 weeks — a cold frame or greenhouse kit is the usual way to keep cool-weather crops going past the first frost.
How much risk comes with planting early here
04/27 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/12 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/15 and only about 1 year in 10 sees frost after that.
Mountain City against the rest of the dataset
About 170 days separate Mountain City's last and first frost, putting it 29,040 of 40,283 ZIP codes nationally. Within TN, it ranks 767 of 770.
Learn more
Two guides worth reading on 37691: the frost range, on how to read the range around Mountain City's dates instead of trusting one, and local microclimates, on what one yard in Mountain City can differ from the 37691 normal.