Smithville, TN 37166 Frost Dates
Frost dates for Smithville, TN, ZIP 37166
The last spring frost here typically falls around 04/18, about 233 days from today. The first fall frost typically arrives around 10/22, about 187 frost-free days later.
The USDA Plant Hardiness Zone Map puts Smithville in Zone 7b (5 to 10°F average annual minimum); frost dates are NOAA's 1991-2020 station normal, not this year's forecast.
What to do before the first frost
Zone 7b around Smithville has about 8 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
04/18 is the middle of 30 years of NOAA records, not a promise. Plant by 04/02 and you're betting against frost in roughly 9 years out of 10. 05/02 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Smithville compares
At roughly 187 frost-free days, Smithville places 22,355 of 40,283 ZIP codes in this dataset. Within TN, it ranks 691 of 770.
Learn more
zone vs. frost date explains why Zone 7b and Smithville's frost date answer different questions, and the frost range explains how to read the range around Smithville's dates instead of trusting one.