Frost dates for Whitwell-Sequatchie Valley, TN
At Whitwell-Sequatchie Valley, the median last spring frost (32°F) is Mar 26 and the median first fall frost is Nov 8, for a typical growing season of 228 days. For a 90% chance that the last frost has passed, wait until Apr 13. Nearby ZIP codes are in USDA hardiness zone 7b.
- Mar 26Last spring frost (median)50% chance of 32°F after this date
- Apr 13Safer planting date10% chance of 32°F after this date
- Nov 8First fall frost (median)50% chance of 32°F by this date
- 228 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 | Mar 21 | Apr 9 | Apr 27 |
| 32°F | Mar 6 | Mar 26 | Apr 13 |
| 28°F | Feb 18 | Mar 12 | Apr 2 |
| 24°F | Feb 3 | Feb 28 | Mar 21 |
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 | Oct 16 | Oct 28 | Nov 12 |
| 32°F | Oct 25 | Nov 8 | Nov 29 |
| 28°F | Nov 4 | Nov 24 | Dec 13 |
| 24°F | Nov 19 | Dec 8 | Jan 1 |
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 | 178 days | 201 days | 225 days |
| 32°F | 203 days | 228 days | 254 days |
| 28°F | 229 days | 256 days | 284 days |
| 24°F | 255 days | 285 days | 316 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 |
|---|---|---|---|
| 37365 | 7b | 5 to 10°F | 10 km |
| 37397 | 7b | 5 to 10°F | 10 km |
| 37377 | 7b | 5 to 10°F | 13 km |
| 37327 | 7b | 5 to 10°F | 16 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 USC00409691, at 35.2897, -85.4736, elevation 311 m (1,020 ft).
- Data quality: Representative (10+ years), 15 years of freeze data.
- Average days per year at or below 32°F: 63.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Soddy Daisy-Mowbray Mountain (21 km)
- Coalmont (22 km)
- Lookout Mtn-Point Park (33 km)
- Monteagle (34 km)
- Chattanooga Lovell Airport (38 km)
- Fall Creek Falls State Park (40 km)
- Sewanee (41 km)
- Pikeville (43 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.