Frost dates for Brunswick Malcolm McKinnon Airport, GA
At Brunswick Malcolm McKinnon Airport, the median last spring frost (32°F) is Feb 9 and the median first fall frost is Dec 26, for a typical growing season of 312 days. For a 90% chance that the last frost has passed, wait until Mar 6. Nearby ZIP codes are in USDA hardiness zone 9a.
- Feb 9Last spring frost (median)50% chance of 32°F after this date
- Mar 6Safer planting date10% chance of 32°F after this date
- Dec 26First fall frost (median)50% chance of 32°F by this date
- 312 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 1 | Feb 27 | Mar 18 |
| 32°F | Jan 11 | Feb 9 | Mar 6 |
| 28°F | Dec 30 | Jan 27 | Feb 26 |
| 24°F | Dec 28 | Jan 18 | Feb 14 |
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 | Nov 16 | Dec 4 | Jan 1 |
| 32°F | Nov 30 | Dec 26 | Jan 19 |
| 28°F | Dec 13 | Jan 8 | Feb 7 |
| 24°F | Dec 21 | Jan 13 | Feb 7 |
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 | 251 days | 282 days | 312 days |
| 32°F | 279 days | 312 days | 346 days |
| 28°F | 308 days | 341 days | 365 days |
| 24°F | 331 days | 365 days | 365 days |
Chance of a freeze in any year
| Temperature | Chance per year |
|---|---|
| 36°F | 100% |
| 32°F | 98% |
| 28°F | 74% |
| 24°F | 34% |
ZIP codes whose closest station is this one
| ZIP | Hardiness zone | Avg. extreme low | Distance |
|---|---|---|---|
| 31527 | 9a | 20 to 25°F | 9 km |
| 31561 | 9a | 20 to 25°F | 10 km |
| 31522 | 9a | 20 to 25°F | 13 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 USW00013878, at 31.1522, -81.3908, elevation 5 m (16 ft).
- Data quality: Standard (24+ years of data), 24 years of freeze data.
- Average days per year at or below 32°F: 8.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Brunswick (11 km)
- Sapelo Island (29 km)
- Woodbine (37 km)
- Brunswick 23 S (39 km)
- Nahunta 6ne (52 km)
- Jesup 8 S (60 km)
- Fort Stewart (83 km)
- Folkston 9 SW (84 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.