Frost dates for Kingsport, TN
At Kingsport, the median last spring frost (32°F) is Apr 9 and the median first fall frost is Oct 29, for a typical growing season of 203 days. For a 90% chance that the last frost has passed, wait until Apr 25. Nearby ZIP codes are in USDA hardiness zones 7a to 7b.
- Apr 9Last spring frost (median)50% chance of 32°F after this date
- Apr 25Safer planting date10% chance of 32°F after this date
- Oct 29First fall frost (median)50% chance of 32°F by this date
- 203 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 6 | Apr 23 | May 10 |
| 32°F | Mar 25 | Apr 9 | Apr 25 |
| 28°F | Mar 10 | Mar 28 | Apr 12 |
| 24°F | Feb 25 | Mar 15 | Mar 31 |
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 6 | Oct 20 | Nov 1 |
| 32°F | Oct 15 | Oct 29 | Nov 10 |
| 28°F | Oct 25 | Nov 6 | Nov 23 |
| 24°F | Nov 4 | Nov 18 | Dec 7 |
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 | 158 days | 180 days | 201 days |
| 32°F | 181 days | 203 days | 223 days |
| 28°F | 202 days | 224 days | 247 days |
| 24°F | 226 days | 250 days | 276 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 |
|---|---|---|---|
| 37664 | 7b | 5 to 10°F | 2 km |
| 37660 | 7b | 5 to 10°F | 4 km |
| 37663 | 7b | 5 to 10°F | 7 km |
| 37665 | 7b | 5 to 10°F | 8 km |
| 24290 | 7b | 5 to 10°F | 11 km |
| 37645 | 7b | 5 to 10°F | 13 km |
| 37656 | 7a | 0 to 5°F | 16 km |
| 24251 | 7a | 0 to 5°F | 17 km |
| 37642 | 7a | 0 to 5°F | 18 km |
| 24258 | 7b | 5 to 10°F | 18 km |
| 24271 | 7a | 0 to 5°F | 27 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 USC00404858, at 36.5194, -82.5275, elevation 391 m (1,284 ft).
- Data quality: Standard (24+ years of data), 30 years of freeze data.
- Average days per year at or below 32°F: 83.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Bristol Tri City Airport (12 km)
- Elizabethton (31 km)
- Rogersville 1 NE (42 km)
- Erwin 1 W (43 km)
- Greeneville Exp. Station (54 km)
- Roan Mountain 3sw (55 km)
- Mountain City 2 (65 km)
- Morristown Radio Wcrk (80 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.