Harriman, TN 37748 Frost Dates
37748, near Harriman, TN: the frost window
The last spring frost here typically falls around 04/03, about 218 days from today. Fall's first freeze usually shows up around 11/04, roughly 215 days after the last spring frost.
Harriman sits in USDA Zone 7b (5 to 10°F average annual minimum). The dates above are NOAA's 1991-2020 normal at the nearest reporting station, a 30-year average, not a forecast.
Stretching the season past the first frost
Harriman'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 Harriman's last frost
04/03 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 03/16 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 04/20 and only about 1 year in 10 sees frost after that.
Harriman against the rest of the dataset
At roughly 215 frost-free days, Harriman places 14,079 of 40,283 ZIP codes in this dataset. Within TN, it ranks 234 of 770.
Learn more
Two guides worth reading on 37748: zone vs. frost date, on why Zone 7b and Harriman's frost date answer different questions, and the frost range, on how to read the range around Harriman's dates instead of trusting one.