Frost dates for Smyrna 6s, TN
At Smyrna 6s, the median last spring frost (32°F) is Apr 13 and the median first fall frost is Oct 21, for a typical growing season of 189 days. For a 90% chance that the last frost has passed, wait until May 4. Nearby ZIP codes are in USDA hardiness zone 7b.
- Apr 13Last spring frost (median)50% chance of 32°F after this date
- May 4Safer planting date10% chance of 32°F after this date
- Oct 21First fall frost (median)50% chance of 32°F by this date
- 189 daysGrowing season (median)between 32°F freezes
Last spring frost dates
The chance that the temperature drops to the threshold after each date.
| Temperature | 90% chance later | 50% chance later | 10% chance later |
|---|---|---|---|
| 36°F | Apr 11 | Apr 29 | May 15 |
| 32°F | Mar 31 | Apr 13 | May 4 |
| 28°F | Mar 18 | Apr 1 | Apr 15 |
| 24°F | Mar 6 | Mar 21 | Apr 5 |
First fall frost dates
The chance that the temperature has dropped to the threshold by each date.
| Temperature | 10% chance by | 50% chance by | 90% chance by |
|---|---|---|---|
| 36°F | Sep 30 | Oct 12 | Oct 24 |
| 32°F | Oct 8 | Oct 21 | Nov 2 |
| 28°F | Oct 16 | Oct 30 | Nov 11 |
| 24°F | Oct 26 | Nov 7 | Nov 27 |
Growing season length
Days between the last spring and first fall freeze, as the length reached in 9, 5 and 1 out of 10 years.
| Temperature | 9 in 10 years at least | 5 in 10 years at least | 1 in 10 years at least |
|---|---|---|---|
| 36°F | 144 days | 166 days | 187 days |
| 32°F | 167 days | 189 days | 209 days |
| 28°F | 192 days | 210 days | 230 days |
| 24°F | 210 days | 231 days | 255 days |
Chance of a freeze in any year
| Temperature | Chance per year |
|---|---|
| 36°F | 100% |
| 32°F | 100% |
| 28°F | 100% |
| 24°F | 100% |
ZIP codes whose closest station is this one
| ZIP | Hardiness zone | Avg. extreme low | Distance |
|---|---|---|---|
| 37167 | 7b | 5 to 10°F | 6 km |
| 37014 | 7b | 5 to 10°F | 8 km |
| 37135 | 7b | 5 to 10°F | 11 km |
| 37086 | 7b | 5 to 10°F | 12 km |
| 37046 | 7b | 5 to 10°F | 19 km |
Not the official USDA Plant Hardiness Zone Map. Zones shown here are the values published in the USDA-ARS / Oregon State University PRISM Group 2023 ZIP code tables, shown unaltered. For the official interactive map, visit planthardiness.ars.usda.gov.
About this station
- NOAA station ID USC00408414, at 35.9106, -86.5578, elevation 168 m (550 ft).
- Data quality: Representative (10+ years), 13 years of freeze data.
- Average days per year at or below 32°F: 102.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Murfreesboro 5 N (17 km)
- Gladeville (21 km)
- Brentwood (22 km)
- Christiana 5w (24 km)
- Nashville Berry Field (25 km)
- Nashville Intl Airport (26 km)
- Franklin Sewage Plant (28 km)
- Shelby Bottoms Nature (32 km)
Sources
- NOAA National Centers for Environmental Information, U.S. Climate Normals 1991–2020, annual/seasonal normals by station (version 1.0.1), file dated June 27, 2023; documentation.
- USDA Agricultural Research Service and PRISM Group, Oregon State University, 2023 Plant Hardiness Zone Map ZIP code tables (CONUS, Alaska, Hawaii, Puerto Rico), files dated November 17, 2023. Data © PRISM Group, Oregon State University, https://prism.oregonstate.edu, accessed November 1, 2026. Official map: planthardiness.ars.usda.gov.
- U.S. Census Bureau, 2024 Gazetteer ZIP Code Tabulation Areas file, dated August 30, 2024 (ZIP centroids used to find the nearest station).
Freeze dates are 30-year probabilities, not forecasts. Check your local forecast before planting tender plants.