Frost dates for Baton Rouge Ryan Airport, LA
At Baton Rouge Ryan Airport, the median last spring frost (32°F) is Feb 25 and the median first fall frost is Nov 26, for a typical growing season of 276 days. For a 90% chance that the last frost has passed, wait until Mar 19. Nearby ZIP codes are in USDA hardiness zone 9a.
- Feb 25Last spring frost (median)50% chance of 32°F after this date
- Mar 19Safer planting date10% chance of 32°F after this date
- Nov 26First fall frost (median)50% chance of 32°F by this date
- 276 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 | Feb 20 | Mar 13 | Apr 1 |
| 32°F | Jan 29 | Feb 25 | Mar 19 |
| 28°F | Jan 4 | Feb 6 | Mar 8 |
| 24°F | Dec 25 | Jan 24 | Feb 23 |
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 30 | Nov 13 | Dec 1 |
| 32°F | Nov 7 | Nov 26 | Dec 19 |
| 28°F | Nov 19 | Dec 11 | Jan 18 |
| 24°F | Dec 4 | Jan 2 | Feb 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 | 221 days | 247 days | 275 days |
| 32°F | 245 days | 276 days | 311 days |
| 28°F | 274 days | 311 days | 351 days |
| 24°F | 310 days | 348 days | 365 days |
Chance of a freeze in any year
| Temperature | Chance per year |
|---|---|
| 36°F | 100% |
| 32°F | 100% |
| 28°F | 97% |
| 24°F | 70% |
ZIP codes whose closest station is this one
| ZIP | Hardiness zone | Avg. extreme low | Distance |
|---|---|---|---|
| 70811 | 9a | 20 to 25°F | 1 km |
| 70813 | 9a | 20 to 25°F | 5 km |
| 70812 | 9a | 20 to 25°F | 5 km |
| 70805 | 9a | 20 to 25°F | 5 km |
| 70714 | 9a | 20 to 25°F | 6 km |
| 70807 | 9a | 20 to 25°F | 6 km |
| 70818 | 9a | 20 to 25°F | 9 km |
| 70814 | 9a | 20 to 25°F | 10 km |
| 70806 | 9a | 20 to 25°F | 10 km |
| 70815 | 9a | 20 to 25°F | 12 km |
| 70791 | 9a | 20 to 25°F | 13 km |
| 70819 | 9a | 20 to 25°F | 15 km |
| 70739 | 9a | 20 to 25°F | 19 km |
| 70786 | 9a | 20 to 25°F | 19 km |
| 70706 | 9a | 20 to 25°F | 24 km |
| 70726 | 9a | 20 to 25°F | 26 km |
| 70785 | 9a | 20 to 25°F | 31 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 USW00013970, at 30.5372, -91.1469, elevation 20 m (64 ft).
- Data quality: Standard (24+ years of data), 29 years of freeze data.
- Average days per year at or below 32°F: 18.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Lsu Ben-Hur Farm (19 km)
- Brusly 2 W (20 km)
- New Roads 5 NE (30 km)
- St. Francisville 1 NE (35 km)
- Clinton 5 SE (35 km)
- Carville 2 SW (38 km)
- Donaldsonville 4 SW (53 km)
- Amite (63 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.