Knoxville, TN 37929 Frost Dates
Frost dates for Knoxville, TN, ZIP 37929
Around 04/06 is the usual last spring frost, about 221 days away. The first fall frost typically arrives around 10/29, about 205 frost-free days later.
Knoxville 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.
What to do before the first frost
Zone 7b around Knoxville has about 9 weeks left before the first fall frost — that's the usual window to get a cold frame up if you want to keep harvesting past it.
How much risk comes with planting early here
04/06 is the middle of 30 years of NOAA records, not a promise. Plant by 03/23 and you're betting against frost in roughly 9 years out of 10. 04/21 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Knoxville compares
At roughly 205 frost-free days, Knoxville places 16,155 of 40,283 ZIP codes in this dataset. Within TN, it ranks 443 of 770.
Learn more
local microclimates explains what one yard in Knoxville can differ from the 37929 normal, and zone vs. frost date explains why Zone 7b and Knoxville's frost date answer different questions.