San Antonio, TX Frost Dates
Average frost dates, USDA hardiness zone, and growing season length for San Antonio, Texas.
Gardening in San Antonio
San Antonio's gardening traditions blend Mexican, German, and Southern influences into something uniquely Texan. The city's long growing season and mild winters make it possible to grow food nearly year-round, and the cultural emphasis on family, food, and outdoor living means gardens here are gathering places, not just production sites.
Hot and getting hotter — San Antonio summers regularly exceed 100°F, making shade and water management essential. But the mild winters are a gardener's gift: you can grow cool-season crops from October through March with minimal frost protection. The Edwards Plateau's alkaline limestone soil is the constant challenge — amend, amend, amend.
Spurs fans understand that consistent, fundamentally sound effort produces championships. Same goes for gardening in San Antonio — it's not flashy, but steady watering, proper timing, and soil amendment produce results year after year. The city's acequia irrigation system dates to the 1700s, making water-wise gardening a San Antonio tradition older than the country itself.
What This Means for San Antonio Gardeners
The average last spring frost in San Antonio is around March 1, and the average first fall frost arrives around November 20. That gives you approximately 264 frost-free days to work with.
264 days is a long, productive season that supports two full rounds of warm-season crops plus continuous cool-season production through your mild winter. Most frost-sensitive crops can be transplanted by March 1, giving them months to produce before fall. Your winter garden is the real advantage — growing fresh vegetables in December and January while northern gardeners browse seed catalogs.
These dates are based on NOAA 30-year Climate Normal data for the San Antonio 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 San Antonio
San Antonio's 264-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 Texas planting guide for all 40 plants: Texas Planting Calendar. Or enter your zip code for exact planting dates personalized to San Antonio.
More About Zone 8B
San Antonio is in USDA Hardiness Zone 8B, which means average annual extreme minimum temperatures between 15°F to 20°F. View the full Zone 8B planting guide.
See the complete planting calendar for Texas: Texas Planting Calendar.
Other Cities in Texas
Frequently Asked Questions
These dates are based on NOAA's 30-year Climate Normal data for the San Antonio 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 San Antonio (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 1). 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.