When to Plant Broccoli in San Antonio, TX
Published: April 21, 2026
Broccoli Planting Dates for San Antonio, TX
| Start seeds indoors | December 21–28 |
| Last frost (average) | February 1 |
| Transplant outdoors | January 4–14 |
| Direct sow outdoors | January 4–14 |
| Minimum soil temperature | 40°F |
| Expect first harvest | March 5 – March 25 |
| Fall crop planting | October 6–16 |
| Fall crop harvest | December 5 |
| First fall frost (average) | December 15 |
Best Broccoli Varieties for San Antonio, TX
For Zone 8b San Antonio, the best-performing broccoli varieties are Calabrese, DeCicco, and Packman — all rated for heat tolerance in warm-zone summers. Green Magic is a solid second choice for the fall crop where a quicker 60-day maturity makes the most of a shorter fall window. These varieties are typically stocked by local nurseries and are the safest bets for gardeners new to broccoli in San Antonio.
Growing Broccoli in San Antonio
San Antonio sits in Zone 8b, with an average last frost of February 1 and first fall frost around December 15 — giving a 317-day frost-free growing season. Cool-season crops like broccoli benefit from San Antonio's cooler spring and fall windows, when temperatures stay in the 55–75°F sweet spot that produces the best flavor and least bolting.
In San Antonio's warm climate, broccoli works best as a fall, winter, and early-spring crop. Summer heat bolts most cool-season vegetables before they can produce a harvestable head or root. Plan primary plantings in October through February in San Antonio, not April through June.
San Antonio's heavy clay soil benefits from raised beds or deep organic matter amendment before planting broccoli. Clay retains moisture well but compacts easily — add 3 to 4 inches of compost and work it in to 12 inches before planting. Consistent watering (1.5 inches per week) is especially important in clay soil, which can crack and pull away from roots during dry spells; mulch around plants to stabilize moisture.
Broccoli Calendar for San Antonio
| Month | Task |
|---|---|
| December | Start seeds indoors under grow lights |
| February | Last frost — harden off seedlings outdoors |
| January | Transplant outdoors into warm soil |
| March | Expect first harvest window to open |
| October | Start fall crop — transplants or direct sow |
| December | First fall frost — harvest remaining, end of outdoor season |
Broccoli Tips for San Antonio Gardeners
- •For spring: start indoors 6 weeks before last frost and transplant outdoors 4 weeks before last frost.
- •For fall: start indoors in summer — count 10 weeks back from your first fall frost date.
- •Plant cool-season broccoli in San Antonio during October through February — spring plantings bolt before producing a usable crop in warm zones.
Common Broccoli Pests in San Antonio
- •Cabbage Worm — peaks June–August in Zone 8b (active March–October); green caterpillars on brassicas; apply Bt spray or use row covers.
- •Cabbage Looper — peaks June–August in Zone 8b (active March–October); loop-walking green caterpillars; Bt spray works well.
- •Aphids — peaks June–August in Zone 8b (active March–October); clusters on leaf undersides; blast with a strong water spray or apply neem oil.
Check plants every 2–3 days during peak season — early intervention prevents most infestations from becoming serious.
What to Plant with Broccoli in San Antonio
In San Antonio's warm climate, Onion and Garlic are the most beneficial plants to grow alongside broccoli. Onion deters carrot fly, aphids, and several root-zone pests through sulfur compounds. Keep broccoli away from Tomato — it competes for nutrients or shares pest pressure. Warm-climate gardeners especially benefit from dense, layered companion plantings that shade soil and reduce water loss.
Frequently Asked Questions
When should I plant broccoli in San Antonio, TX?
In San Antonio (Zone 8b), start broccoli seeds indoors around December 21–28 and transplant outdoors around January 4–14. The city's average last frost of February 1 is the anchor date — count 6 weeks back for seed starting and 4 weeks back for transplanting.
What zone is San Antonio, TX for broccoli growing?
San Antonio is USDA Zone 8b. For broccoli, this means a frost-free growing season of roughly 45 weeks running from February 1 to December 15. Cool-season crops like broccoli thrive in this zone with both spring and fall planting windows available.
When is broccoli harvest season in San Antonio?
Expect the first broccoli harvest in San Antonio around March 5, with harvest continuing through March 25. This is based on 60–80 days from transplant or direct sow. A fall crop planted October 6–16 adds a second harvest around December 5.
How long does it take to grow broccoli in San Antonio, TX?
From transplant or direct sow to first harvest, broccoli takes 60–80 days in San Antonio's climate. Based on a typical planting date of January 4–14, expect your first harvest around March 5. San Antonio's warm Zone 8b climate tends toward the faster end of this range — warmer soil and longer days accelerate maturity.
What soil does broccoli need in San Antonio?
San Antonio's heavy clay soil compacts easily and drains slowly — problematic for broccoli which needs oxygenated roots. Build a raised bed or amend deeply with 3–4 inches of compost worked into the top 12 inches. Add gypsum if the soil is severely compacted. Consistent watering matters especially in clay because the soil can crack and pull away from roots during dry spells.