Huntsville, AL Frost Dates
Average frost dates, USDA hardiness zone, and growing season length for Huntsville, Alabama.
Gardening in Huntsville
The Rocket City's engineering culture extends to methodical, productive gardens. NASA and defense contractors bring analytical minds that optimize growing systems with the same rigor they apply to spacecraft.
North Alabama's 222-day growing season is slightly shorter than the Gulf Coast but still generous. The Tennessee Valley creates a warm corridor with fertile bottomland. Summer heat is real but moderated compared to Montgomery or Mobile.
Redstone Arsenal brings gardeners from around the world. The Madison County Farmers Market connects the Tennessee Valley's agricultural heritage to Huntsville's rapidly growing, tech-savvy population.
What This Means for Huntsville Gardeners
The average last spring frost in Huntsville 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 Huntsville 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 Huntsville
Huntsville'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 Alabama planting guide for all 40 plants: Alabama Planting Calendar. Or enter your zip code for exact planting dates personalized to Huntsville.
More About Zone 7B
Huntsville 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 Alabama: Alabama Planting Calendar.
Other Cities in Alabama
Frequently Asked Questions
These dates are based on NOAA's 30-year Climate Normal data for the Huntsville 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 Huntsville (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.