When to Plant Turnips in San Antonio, TX
Published: April 24, 2026
Turnip Planting Dates for San Antonio, TX
| Start seeds indoors | Year-round |
| Last frost (average) | February 1 |
| Direct sow outdoors | January 11–21 |
| Minimum soil temperature | 40°F |
| Expect first harvest | February 15 – March 12 |
| Fall crop planting | October 20–30 |
| Fall crop harvest | November 24 |
| First fall frost (average) | December 15 |
⚠ Direct sow turnips 2–4 weeks before last frost for spring crop. Best planted in late summer (6–8 weeks before first fall frost) for fall harvest — frost sweetens the roots. Fast-growing: some varieties ready in just 35 days.
Best Turnip Varieties for San Antonio, TX
Consult a San Antonio-area nursery or your state extension office for turnip varieties proven in Zone 8b.
Growing Turnips 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 turnip 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, turnip 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 turnip. 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 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.
Turnip Calendar for San Antonio
| Month | Task |
|---|---|
| Year | Start seeds indoors under grow lights |
| February | Last frost — soil warming, prepare bed |
| January | Direct sow seeds into warm soil |
| February | Expect first harvest window to open |
| October | Start fall crop — transplants or direct sow |
| December | First fall frost — harvest remaining, end of outdoor season |
Turnip Tips for San Antonio Gardeners
- •Thin seedlings to 4-inch spacing when plants are 3 inches tall — crowded turnips produce small woody roots.
- •Both roots AND greens are edible — harvest baby turnip greens 4 weeks after sowing, roots 5–9 weeks.
- •Plant cool-season turnip in San Antonio during October through February — spring plantings bolt before producing a usable crop in warm zones.
Common Turnip Pests in San Antonio
- •Flea Beetle — peaks June–August in Zone 8b (active March–October); tiny black beetles that riddle leaves with holes; row covers protect seedlings.
- •Aphid — peaks June–August in Zone 8b (active March–October); monitor closely during peak season and treat early.
- •Cabbage Root Maggot — peaks June–August in Zone 8b (active March–October); monitor closely during peak season and treat early.
Check plants every 2–3 days during peak season — early intervention prevents most infestations from becoming serious.
What to Plant with Turnips in San Antonio
In San Antonio's warm climate, Pea and Mint are the most beneficial plants to grow alongside turnip. Pea improves nearby plant health and pest resistance. Keep turnip away from Potato — it competes for nutrients and shares blight diseases. Warm-climate gardeners especially benefit from dense, layered companion plantings that shade soil and reduce water loss.
Frequently Asked Questions
When should I plant turnip in San Antonio, TX?
In San Antonio (Zone 8b), direct sow turnip around January 11–21. Soil must be at 40°F or warmer at 2-inch depth before sowing — cold soil rots the seeds.
What zone is San Antonio, TX for turnip growing?
San Antonio is USDA Zone 8b. For turnip, this means a frost-free growing season of roughly 45 weeks running from February 1 to December 15. Cool-season crops like turnip thrive in this zone with both spring and fall planting windows available.
When is turnip harvest season in San Antonio?
Expect the first turnip harvest in San Antonio around February 15, with harvest continuing through March 12. This is based on 35–60 days from transplant or direct sow. A fall crop planted October 20–30 adds a second harvest around November 24.
How long does it take to grow turnip in San Antonio, TX?
From transplant or direct sow to first harvest, turnip takes 35–60 days in San Antonio's climate. Based on a typical planting date of January 11–21, expect your first harvest around February 15. 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 turnip need in San Antonio?
San Antonio's heavy clay soil compacts easily and drains slowly — problematic for turnip 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.