Frost dates for Coalmont, TN
At Coalmont, the median last spring frost (32°F) is Apr 21 and the median first fall frost is Oct 20, for a typical growing season of 182 days. For a 90% chance that the last frost has passed, wait until May 10. Nearby ZIP codes are in USDA hardiness zones 7a to 7b.
- Apr 21Last spring frost (median)50% chance of 32°F after this date
- May 10Safer planting date10% chance of 32°F after this date
- Oct 20First fall frost (median)50% chance of 32°F by this date
- 182 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 16 | May 2 | May 19 |
| 32°F | Apr 1 | Apr 21 | May 10 |
| 28°F | Mar 20 | Apr 7 | Apr 29 |
| 24°F | Mar 5 | Mar 25 | Apr 11 |
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 11 | Oct 24 |
| 32°F | Oct 7 | Oct 20 | Nov 2 |
| 28°F | Oct 16 | Oct 30 | Nov 15 |
| 24°F | Oct 26 | Nov 10 | Dec 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 | 141 days | 161 days | 181 days |
| 32°F | 159 days | 182 days | 204 days |
| 28°F | 181 days | 206 days | 232 days |
| 24°F | 206 days | 231 days | 258 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 |
|---|---|---|---|
| 37313 | 7a | 0 to 5°F | 1 km |
| 37339 | 7a | 0 to 5°F | 6 km |
| 37305 | 7a | 0 to 5°F | 10 km |
| 37301 | 7b | 5 to 10°F | 10 km |
| 37387 | 7a | 0 to 5°F | 11 km |
| 37366 | 7b | 5 to 10°F | 12 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 USC00401887, at 35.3683, -85.7014, elevation 566 m (1,856 ft).
- Data quality: Representative (10+ years), 22 years of freeze data.
- Average days per year at or below 32°F: 103.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Monteagle (20 km)
- Whitwell-Sequatchie Valley (22 km)
- Sewanee (27 km)
- Mc Minnville (35 km)
- Winchester 5se (38 km)
- Manchester #2 (39 km)
- Soddy Daisy-Mowbray Mountain (43 km)
- Fall Creek Falls State Park (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.