Frost dates for Mountain City 2, TN
At Mountain City 2, the median last spring frost (32°F) is Apr 27 and the median first fall frost is Oct 14, for a typical growing season of 170 days. For a 90% chance that the last frost has passed, wait until May 15. Nearby ZIP codes are in USDA hardiness zones 6b to 7a.
- Apr 27Last spring frost (median)50% chance of 32°F after this date
- May 15Safer planting date10% chance of 32°F after this date
- Oct 14First fall frost (median)50% chance of 32°F by this date
- 170 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 24 | May 9 | May 25 |
| 32°F | Apr 12 | Apr 27 | May 15 |
| 28°F | Mar 29 | Apr 12 | Apr 28 |
| 24°F | Mar 15 | Apr 1 | Apr 15 |
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 23 | Oct 6 | Oct 20 |
| 32°F | Oct 3 | Oct 14 | Oct 30 |
| 28°F | Oct 10 | Oct 24 | Nov 6 |
| 24°F | Oct 20 | Nov 3 | Nov 19 |
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 | 129 days | 149 days | 169 days |
| 32°F | 149 days | 170 days | 192 days |
| 28°F | 173 days | 194 days | 214 days |
| 24°F | 195 days | 217 days | 240 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 |
|---|---|---|---|
| 37683 | 7a | 0 to 5°F | 3 km |
| 37688 | 7a | 0 to 5°F | 11 km |
| 28615 | 7a | 0 to 5°F | 12 km |
| 37691 | 7a | 0 to 5°F | 13 km |
| 37680 | 7a | 0 to 5°F | 13 km |
| 24236 | 7a | 0 to 5°F | 20 km |
| 24292 | 6b | -5 to 0°F | 25 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 USC00406292, at 36.4739, -81.8033, elevation 737 m (2,419 ft).
- Data quality: Standard (24+ years of data), 26 years of freeze data.
- Average days per year at or below 32°F: 126.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Elizabethton (42 km)
- Roan Mountain 3sw (43 km)
- Bristol Tri City Airport (54 km)
- Kingsport (65 km)
- Erwin 1 W (67 km)
- Greeneville Exp. Station (102 km)
- Rogersville 1 NE (106 km)
- Newport 1 NW (137 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.