Frost dates for Decatur 7ne, TN
At Decatur 7ne, the median last spring frost (32°F) is Apr 10 and the median first fall frost is Oct 27, for a typical growing season of 199 days. For a 90% chance that the last frost has passed, wait until Apr 28. Nearby ZIP codes are in USDA hardiness zone 7b.
- Apr 10Last spring frost (median)50% chance of 32°F after this date
- Apr 28Safer planting date10% chance of 32°F after this date
- Oct 27First fall frost (median)50% chance of 32°F by this date
- 199 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 7 | Apr 24 | May 9 |
| 32°F | Mar 24 | Apr 10 | Apr 28 |
| 28°F | Mar 8 | Mar 30 | Apr 16 |
| 24°F | Feb 22 | Mar 15 | Apr 3 |
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 8 | Oct 19 | Oct 31 |
| 32°F | Oct 14 | Oct 27 | Nov 9 |
| 28°F | Oct 24 | Nov 5 | Nov 21 |
| 24°F | Nov 1 | Nov 17 | 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 | 158 days | 178 days | 197 days |
| 32°F | 177 days | 199 days | 221 days |
| 28°F | 198 days | 220 days | 245 days |
| 24°F | 222 days | 247 days | 275 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 |
|---|---|---|---|
| 37880 | 7b | 5 to 10°F | 7 km |
| 37826 | 7b | 5 to 10°F | 11 km |
| 37846 | 7b | 5 to 10°F | 17 km |
| 37874 | 7b | 5 to 10°F | 19 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 USC00402388, at 35.6394, -84.6650, elevation 229 m (750 ft).
- Data quality: Representative (10+ years), 20 years of freeze data.
- Average days per year at or below 32°F: 99.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Spring City (18 km)
- Rockwood 2 (22 km)
- Athens (24 km)
- Kingston (27 km)
- Dayton 2se (35 km)
- Lenoir City (40 km)
- Tellico Plains (45 km)
- Pikeville (48 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.