Knoxville, TN 37933 Frost Dates
Knoxville, TN: when does the frost end?
Around 04/01 is the usual last spring frost, about 216 days away. 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
With roughly 9 weeks until Knoxville's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
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 14,004 of 40,283 US ZIP codes measured here, longest to shortest. Within TN, it ranks 220 of 770.
Learn more
Before leaning on 37933's figures: the frost range explains how to read the range around Knoxville's dates instead of trusting one, while local microclimates explains what one yard in Knoxville can differ from the 37933 normal.