Tennessee Frost Dates & Growing Season Guide
Tennessee (TN) spans USDA hardiness zones 7a, 7b, with growing seasons ranging from 209 days in Knoxville to 233 days in Memphis. The average growing season across the state is approximately 219 days.
Tennessee 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.
Planting Windows for Tennessee
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 |
|---|---|---|---|
| Nashville | February 12 | April 15 | August 21 |
| Memphis | January 31 | April 3 | August 30 |
| Knoxville | February 13 | April 16 | August 19 |
| Chattanooga | February 8 | April 11 | August 25 |
Gardening in Tennessee
Tennessee's moderate climate and rolling terrain offer favorable gardening conditions across the state. The state spans zones 6b to 7b, with Memphis in the west having the longest season at 233 days and mountain areas in the east having shorter seasons. Middle Tennessee around Nashville sits in a comfortable zone 7a with 212 frost-free days. The state's diverse soils include fertile river bottoms, rocky limestone uplands, and acidic mountain soils. Tennessee's reliable rainfall supports gardening without heavy irrigation in most years. Tomatoes, peppers, squash, beans, and sweet corn are garden staples. The moderate winter cold provides the chill hours that fruit trees, berries, and perennials need for proper dormancy and spring bloom.
Understanding Tennessee's Hardiness Zones
Tennessee includes USDA hardiness zones 7a, 7b. 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 Tennessee 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.