Frost dates for Morristown Radio Wcrk, TN
At Morristown Radio Wcrk, the median last spring frost (32°F) is Apr 10 and the median first fall frost is Oct 28, for a typical growing season of 201 days. For a 90% chance that the last frost has passed, wait until Apr 26. Nearby ZIP codes are in USDA hardiness zone 7b.
- Apr 10Last spring frost (median)50% chance of 32°F after this date
- Apr 26Safer planting date10% chance of 32°F after this date
- Oct 28First fall frost (median)50% chance of 32°F by this date
- 201 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 5 | Apr 22 | May 8 |
| 32°F | Mar 25 | Apr 10 | Apr 26 |
| 28°F | Mar 11 | Mar 29 | Apr 14 |
| 24°F | Feb 24 | Mar 16 | Apr 2 |
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 9 | Oct 20 | Nov 1 |
| 32°F | Oct 16 | Oct 28 | Nov 9 |
| 28°F | Oct 26 | Nov 6 | Nov 22 |
| 24°F | Nov 5 | Nov 19 | Dec 6 |
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 | 160 days | 181 days | 200 days |
| 32°F | 181 days | 201 days | 221 days |
| 28°F | 203 days | 224 days | 248 days |
| 24°F | 226 days | 248 days | 274 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 |
|---|---|---|---|
| 37814 | 7b | 5 to 10°F | 3 km |
| 37813 | 7b | 5 to 10°F | 8 km |
| 37708 | 7b | 5 to 10°F | 14 km |
| 37860 | 7b | 5 to 10°F | 14 km |
| 37811 | 7b | 5 to 10°F | 19 km |
| 37810 | 7b | 5 to 10°F | 21 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 USC00406271, at 36.2067, -83.3325, elevation 410 m (1,344 ft).
- Data quality: Representative (10+ years), 22 years of freeze data.
- Average days per year at or below 32°F: 84.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Morristown WFO (8 km)
- Jefferson City (16 km)
- Newport 1 NW (28 km)
- Tazewell (35 km)
- Rogersville 1 NE (39 km)
- Sevierville (39 km)
- Greeneville Exp. Station (45 km)
- Gatlinburg 2 SW (61 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.