Knoxville, TN 37917 Frost Dates
37917, near Knoxville, TN: the frost window
The last spring frost here typically falls around 04/01, about 216 days from today. Fall's first freeze usually shows up around 11/02, roughly 215 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 Knoxville, not a forecast for this year.
Stretching the season past the first frost
Knoxville's growing season runs out in roughly 9 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 Knoxville's last frost
04/01 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 04/17 and only about 1 year in 10 sees frost after that.
Knoxville against the rest of the dataset
Knoxville's growing season runs about 215 days, ranking 13,996 of 40,283 US ZIP codes measured here, longest to shortest. Within TN, it ranks 212 of 770.
Learn more
Two guides worth reading on 37917: local microclimates, on what one yard in Knoxville can differ from the 37917 normal, and zone vs. frost date, on why Zone 7b and Knoxville's frost date answer different questions.