Mississippi spans several USDA Plant Hardiness Zones, reflecting its range of average annual extreme minimum temperatures. The state includes zones 7b, 8a, 8b, 9a, and 9b.
- The northeastern part of Mississippi is mostly in zone 7b.
- Central and lower parts of the state fall into zones 8a and 8b.
- The southern coastal region, including the Gulf Coast, is in zones 9a and 9b, with the very southern tip and some coastal counties in zone 9a or 9b
These zones correspond to average minimum winter temperatures roughly from 5°F in zone 7b up to 30°F in zone 9b. The recent 2024 updates show zone 8b now covering about half the state, with zone 9a expanding along the coast and zone 7b covering some northern counties
