Calhoun, TN 37309 Frost Dates
Frost dates for Calhoun, TN, ZIP 37309
The last spring frost here typically falls around 04/06, about 221 days from today. The first fall frost typically arrives around 10/31, about 208 frost-free days later.
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 Calhoun, not a forecast for this year.
What to do before the first frost
Zone 7b around Calhoun 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.
Why 04/06 isn't a guarantee
04/06 is the middle of 30 years of NOAA records, not a promise. Plant by 03/20 and you're betting against frost in roughly 9 years out of 10. 04/24 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Calhoun compares
Calhoun's growing season runs about 208 days, ranking 15,714 of 40,283 US ZIP codes measured here, longest to shortest. Within TN, it ranks 392 of 770.
Learn more
local microclimates explains what one yard in Calhoun can differ from the 37309 normal, and zone vs. frost date explains why Zone 7b and Calhoun's frost date answer different questions.