Frost dates for Bay St. Louis Nasa, MS
At Bay St. Louis Nasa, the median last spring frost (32°F) is Mar 6 and the median first fall frost is Nov 19, for a typical growing season of 262 days. For a 90% chance that the last frost has passed, wait until Mar 27. Nearby ZIP codes are in USDA hardiness zone 9a.
- Mar 6Last spring frost (median)50% chance of 32°F after this date
- Mar 27Safer planting date10% chance of 32°F after this date
- Nov 19First fall frost (median)50% chance of 32°F by this date
- 262 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 27 | Mar 22 | Apr 11 |
| 32°F | Feb 5 | Mar 6 | Mar 27 |
| 28°F | Jan 12 | Feb 16 | Mar 16 |
| 24°F | Dec 25 | Jan 30 | Mar 5 |
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 26 | Nov 7 | Nov 27 |
| 32°F | Nov 3 | Nov 19 | Dec 13 |
| 28°F | Nov 9 | Dec 4 | Jan 16 |
| 24°F | Nov 23 | Dec 31 | Feb 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 | 206 days | 235 days | 264 days |
| 32°F | 231 days | 262 days | 299 days |
| 28°F | 256 days | 296 days | 337 days |
| 24°F | 289 days | 334 days | 365 days |
Chance of a freeze in any year
| Temperature | Chance per year |
|---|---|
| 36°F | 100% |
| 32°F | 100% |
| 28°F | 98% |
| 24°F | 80% |
ZIP codes whose closest station is this one
| ZIP | Hardiness zone | Avg. extreme low | Distance |
|---|---|---|---|
| 39529 | 9a | 20 to 25°F | 0 km |
| 39572 | 9a | 20 to 25°F | 14 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 USC00220521, at 30.3758, -89.5989, elevation 9 m (30 ft).
- Data quality: Representative (10+ years), 15 years of freeze data.
- Average days per year at or below 32°F: 31.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Picayune (21 km)
- Waveland (23 km)
- Gulfport Naval Center (46 km)
- Gulfport - Biloxi Airport (50 km)
- Poplarville Exp. Station (52 km)
- Biloxi (57 km)
- Saucier Exp. Forest (59 km)
- Wiggins (72 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.