Louisiana Frost Dates & Growing Season Guide
Louisiana (LA) spans USDA hardiness zones 8a, 8b, 9a, with growing seasons ranging from 252 days in Shreveport to 298 days in New Orleans. The average growing season across the state is approximately 279 days.
Louisiana City Frost Dates
The table below shows the average last spring frost date, first fall frost date, growing season length, and USDA hardiness zone for each city. Click a city name for detailed planting calendars and zone information.
| City | Last Spring Frost | First Fall Frost | Growing Season | Zone | Min Temp |
|---|---|---|---|---|---|
| Baton Rouge | February 22 | November 28 | 279 days | 8b | 15°F |
| New Orleans | February 10 | December 5 | 298 days | 9a | 20°F |
| Shreveport | March 8 | November 15 | 252 days | 8a | 10°F |
| Lafayette | February 18 | December 1 | 286 days | 9a | 20°F |
Planting Windows for Louisiana
Based on average frost dates, here are the recommended planting windows for each city. The indoor seed start date is approximately seven weeks before the last spring frost. Transplanting should occur about two weeks after the last frost. The last direct sow date for fall crops is ten weeks before the first fall frost.
| City | Start Seeds Indoors | Transplant After | Last Direct Sow |
|---|---|---|---|
| Baton Rouge | January 4 | March 7 | September 19 |
| New Orleans | December 23 | February 24 | September 26 |
| Shreveport | January 19 | March 22 | September 6 |
| Lafayette | December 31 | March 3 | September 22 |
Gardening in Louisiana
Louisiana's subtropical climate delivers one of the longest growing seasons in the country, with 250 to 298 frost-free days depending on location. The state's rich alluvial soils along river systems are naturally fertile. Summer heat and humidity are intense, favoring heat-tolerant crops like okra, southern peas, sweet potatoes, and hot peppers. Tropical fruit experiments with figs, satsuma oranges, and even cold-hardy bananas succeed in protected spots. Disease and pest pressure runs high in Louisiana's wet conditions, making proper spacing, drainage, and integrated pest management essential. Fall and winter vegetable gardening is excellent, with cool-season greens producing from October through March.
Understanding Louisiana's Hardiness Zones
Louisiana includes USDA hardiness zones 8a, 8b, 9a. These zones indicate the average annual extreme minimum winter temperature for each area, which determines which perennial plants, trees, and shrubs can survive winter without protection. When purchasing trees, shrubs, or perennial flowers, always check that the plant is rated for your hardiness zone or a lower (colder) zone number.
Tips for Using Louisiana Frost Dates
These frost dates represent long-term averages and should be treated as guidelines rather than guarantees. In any given year, the actual last spring frost or first fall frost may arrive one to three weeks earlier or later than the average. Factors that affect your specific location include elevation above the city center, proximity to water, slope direction, and whether you are in an urban or rural area. South-facing slopes and areas near large pavement or building masses tend to be warmer than surrounding open land. Low-lying valleys and exposed hilltops are often colder than mid-slope positions.
To protect against late spring frosts, keep row cover fabric, old bed sheets, or frost blankets on hand. Monitor your local weather forecast daily as the average frost date approaches. When frost is predicted after you have transplanted, covering plants in the late afternoon traps ground heat and can protect against temperatures down to about 28 degrees Fahrenheit. For fall season extension, the same covers protect mature plants from early frosts, often buying several additional weeks of harvest.