Frost dates for Huntsville Intl Airport, AL
At Huntsville Intl Airport, the median last spring frost (32°F) is Mar 24 and the median first fall frost is Nov 8, for a typical growing season of 229 days. For a 90% chance that the last frost has passed, wait until Apr 8. Nearby ZIP codes are in USDA hardiness zone 8a.
- Mar 24Last spring frost (median)50% chance of 32°F after this date
- Apr 8Safer planting date10% chance of 32°F after this date
- Nov 8First fall frost (median)50% chance of 32°F by this date
- 229 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 17 | Apr 4 | Apr 19 |
| 32°F | Mar 4 | Mar 24 | Apr 8 |
| 28°F | Feb 19 | Mar 10 | Mar 29 |
| 24°F | Jan 31 | Feb 24 | Mar 19 |
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 17 | Oct 30 | Nov 12 |
| 32°F | Oct 27 | Nov 8 | Nov 25 |
| 28°F | Nov 3 | Nov 20 | Dec 8 |
| 24°F | Nov 12 | Dec 3 | Jan 3 |
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 | 189 days | 207 days | 229 days |
| 32°F | 208 days | 229 days | 255 days |
| 28°F | 230 days | 256 days | 284 days |
| 24°F | 251 days | 283 days | 318 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 |
|---|---|---|---|
| 35756 | 8a | 10 to 15°F | 3 km |
| 35824 | 8a | 10 to 15°F | 3 km |
| 35758 | 8a | 10 to 15°F | 8 km |
| 35808 | 8a | 10 to 15°F | 12 km |
| 35775 | 8a | 10 to 15°F | 13 km |
| 35757 | 8a | 10 to 15°F | 16 km |
| 35806 | 8a | 10 to 15°F | 17 km |
| 35805 | 8a | 10 to 15°F | 17 km |
| 35896 | 8a | 10 to 15°F | 17 km |
| 35816 | 8a | 10 to 15°F | 18 km |
| 35670 | 8a | 10 to 15°F | 21 km |
| 35810 | 8a | 10 to 15°F | 24 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 USW00003856, at 34.6439, -86.7861, elevation 190 m (624 ft).
- Data quality: Standard (24+ years of data), 30 years of freeze data.
- Average days per year at or below 32°F: 56.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Belle Mina 2 N (10 km)
- Decatur Pryor Field (15 km)
- Decatur 4se (16 km)
- Athens (21 km)
- Owens Cross Roads 3s (33 km)
- Cullman 3 ENE (50 km)
- Moulton 2 (50 km)
- Cullman Nahs (50 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.