Frost dates for Troy Muni Airport, AL
At Troy Muni Airport, the median last spring frost (32°F) is Mar 18 and the median first fall frost is Nov 10, for a typical growing season of 236 days. For a 90% chance that the last frost has passed, wait until Apr 7. Nearby ZIP codes are in USDA hardiness zone 8b.
- Mar 18Last spring frost (median)50% chance of 32°F after this date
- Apr 7Safer planting date10% chance of 32°F after this date
- Nov 10First fall frost (median)50% chance of 32°F by this date
- 236 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 15 | Apr 2 | Apr 20 |
| 32°F | Feb 24 | Mar 18 | Apr 7 |
| 28°F | Feb 3 | Mar 2 | Mar 23 |
| 24°F | Jan 13 | Feb 12 | Mar 11 |
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 18 | Oct 31 | Nov 13 |
| 32°F | Oct 28 | Nov 10 | Nov 29 |
| 28°F | Nov 5 | Nov 21 | Dec 20 |
| 24°F | Nov 16 | Dec 9 | Jan 15 |
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 | 188 days | 210 days | 235 days |
| 32°F | 209 days | 236 days | 266 days |
| 28°F | 239 days | 266 days | 300 days |
| 24°F | 265 days | 303 days | 338 days |
Chance of a freeze in any year
| Temperature | Chance per year |
|---|---|
| 36°F | 100% |
| 32°F | 100% |
| 28°F | 100% |
| 24°F | 98% |
ZIP codes whose closest station is this one
| ZIP | Hardiness zone | Avg. extreme low | Distance |
|---|---|---|---|
| 36081 | 8b | 15 to 20°F | 12 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 USW00003878, at 31.8606, -86.0122, elevation 121 m (397 ft).
- Data quality: Representative (10+ years), 19 years of freeze data.
- Average days per year at or below 32°F: 47.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Troy (7 km)
- Troy 2 W (8 km)
- Highland Home (23 km)
- Highland Home 2 S (29 km)
- Highland Home #2 (30 km)
- Union Springs 9 S (30 km)
- Montgomery 6sw (48 km)
- Clayton (53 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.