Chattanooga, TN Frost Dates
Average frost dates, USDA hardiness zone, and growing season length for Chattanooga, Tennessee.
Gardening in Chattanooga
The Scenic City's Tennessee River setting and mountain surroundings create a beautiful backdrop for gardens that benefit from valley warmth and mountain rainfall. Chattanooga's riverfront revitalization extends to its food garden culture.
The Tennessee Valley creates a warm corridor — Chattanooga's 222-day growing season is longer than Nashville's because the river and surrounding ridges moderate temperature extremes. The valley floor soil is deep alluvial, while ridge-top gardens work with thinner, rocky soil.
The Tennessee Aquarium put Chattanooga on the map; the city's community gardens are keeping it there. Crabtree Farms and the Main Street Farmers Market connect Chattanooga's food-growing heritage with its revitalized downtown.
What This Means for Chattanooga Gardeners
The average last spring frost in Chattanooga is around March 28, and the average first fall frost arrives around November 5. That gives you approximately 222 frost-free days to work with.
That's a generous season. You have time for full-size tomatoes, long-season peppers, and even watermelons without the anxiety of racing the frost. Start warm-season seeds indoors 6-8 weeks before your last frost to hit the ground running. Fall planting is your second opportunity — garlic, kale, lettuce, and broccoli all go in 8-10 weeks before your first frost for harvest into late autumn.
These dates are based on NOAA 30-year Climate Normal data for the Chattanooga area. Your actual frost dates could shift 2-3 weeks in either direction in any given year. Learn more about our data sources.
What to Grow in Chattanooga
Chattanooga's 222-day growing season is generous — long enough for two full growing windows (spring and fall) with warm-season crops between them. You can grow the full range of vegetables, herbs, and flowers with proper timing. Focus on heat-tolerant varieties for midsummer and cool-season crops for extended fall harvests. Recommended starting points: tomatoes, peppers, beans, cucumbers, squash, garlic, kale, and sunflowers.
See the full Tennessee planting guide for all 40 plants: Tennessee Planting Calendar. Or enter your zip code for exact planting dates personalized to Chattanooga.
More About Zone 7B
Chattanooga is in USDA Hardiness Zone 7B, which means average annual extreme minimum temperatures between 5°F to 10°F. View the full Zone 7B planting guide.
See the complete planting calendar for Tennessee: Tennessee Planting Calendar.
Other Cities in Tennessee
Frequently Asked Questions
These dates are based on NOAA's 30-year Climate Normal data for the Chattanooga area. They represent historical averages, not predictions. In any given year, the actual last frost could be 2-3 weeks earlier or later. Microclimates within Chattanooga (urban heat islands, hilltops, low-lying valleys) can also shift your local frost dates by a week or more.
Cool-season crops go in 3-4 weeks before your last frost (March 28). Warm-season crops wait until 2 weeks after. You have time for a fall round too — plant cool-season crops again in late summer for harvest into autumn. Enter your zip code for exact dates.