Frost dates for Decatur 4se, AL
At Decatur 4se, the median last spring frost (32°F) is Mar 26 and the median first fall frost is Nov 7, for a typical growing season of 228 days. For a 90% chance that the last frost has passed, wait until Apr 9. Nearby ZIP codes are in USDA hardiness zone 8a.
- Mar 26Last spring frost (median)50% chance of 32°F after this date
- Apr 9Safer planting date10% chance of 32°F after this date
- Nov 7First fall frost (median)50% chance of 32°F by this date
- 228 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 | Mar 21 | Apr 5 | Apr 22 |
| 32°F | Mar 5 | Mar 26 | Apr 9 |
| 28°F | Feb 21 | Mar 12 | Mar 30 |
| 24°F | Feb 4 | Feb 26 | Mar 18 |
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 16 | Oct 29 | Nov 11 |
| 32°F | Oct 26 | Nov 7 | Nov 26 |
| 28°F | Nov 4 | Nov 19 | Dec 10 |
| 24°F | Nov 12 | Dec 3 | Jan 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 | 187 days | 205 days | 227 days |
| 32°F | 205 days | 228 days | 252 days |
| 28°F | 228 days | 253 days | 279 days |
| 24°F | 252 days | 281 days | 312 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 |
|---|---|---|---|
| 35603 | 8a | 10 to 15°F | 6 km |
| 35601 | 8a | 10 to 15°F | 8 km |
| 35640 | 8a | 10 to 15°F | 15 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 USC00012209, at 34.5756, -86.9339, elevation 168 m (550 ft).
- Data quality: Representative (10+ years), 19 years of freeze data.
- Average days per year at or below 32°F: 52.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Decatur Pryor Field (9 km)
- Belle Mina 2 N (13 km)
- Huntsville Intl Airport (16 km)
- Athens (22 km)
- Moulton 2 (35 km)
- Courtland 2 WSW (39 km)
- Addison (42 km)
- Cullman 3 ENE (44 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.