When to Plant Turnips in Santa Rosa, CA
Published: April 24, 2026
Turnip Planting Dates for Santa Rosa, CA
| Start seeds indoors | Year-round |
| Last frost (average) | March 22 |
| Direct sow outdoors | March 1–11 |
| Minimum soil temperature | 40°F |
| Expect first harvest | April 5 – April 30 |
| Fall crop planting | September 15–25 |
| Fall crop harvest | October 20 |
| First fall frost (average) | November 10 |
⚠ 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 Santa Rosa, CA
Consult a Santa Rosa-area nursery or your state extension office for turnip varieties proven in Zone 6b.
Growing Turnips in Santa Rosa
Santa Rosa sits in Zone 6b, with an average last frost of March 22 and first fall frost around November 10 — giving a 233-day frost-free growing season. Cool-season crops like turnip benefit from Santa Rosa's cooler spring and fall windows, when temperatures stay in the 55–75°F sweet spot that produces the best flavor and least bolting.
Santa Rosa's moderate climate supports turnip on the standard transplant calendar with minimal special accommodation. Succession planting — sowing fresh seeds or setting new transplants every 2–3 weeks through spring — stretches the harvest window and gives you a backup crop if pests hit the first planting.
Santa Rosa's mixed soil conditions vary block by block — get a soil test if you have not in three years. Generally, a base of quality compost (2 to 3 inches annually) and consistent watering at 1 inches per week serves turnip well across most soil types found in Santa Rosa.
Turnip Calendar for Santa Rosa
| Month | Task |
|---|---|
| Year | Start seeds indoors under grow lights |
| March | Direct sow seeds into warm soil |
| April | Expect first harvest window to open |
| September | Start fall crop — transplants or direct sow |
| November | First fall frost — harvest remaining, end of outdoor season |
Turnip Tips for Santa Rosa 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.
- •Succession plant turnip in Santa Rosa every 2–3 weeks through spring to extend the harvest window into summer.
Common Turnip Pests in Santa Rosa
- •Flea Beetle — peaks July in Zone 6b (active May–September); tiny black beetles that riddle leaves with holes; row covers protect seedlings.
- •Aphid — peaks July in Zone 6b (active May–September); monitor closely during peak season and treat early.
- •Cabbage Root Maggot — peaks July in Zone 6b (active May–September); 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 Santa Rosa
In Santa Rosa's moderate 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.
Frequently Asked Questions
When should I plant turnip in Santa Rosa, CA?
In Santa Rosa (Zone 6b), direct sow turnip around March 1–11. Soil must be at 40°F or warmer at 2-inch depth before sowing — cold soil rots the seeds.
What zone is Santa Rosa, CA for turnip growing?
Santa Rosa is USDA Zone 6b. For turnip, this means a frost-free growing season of roughly 33 weeks running from March 22 to November 10. Cool-season crops like turnip thrive in this zone with both spring and fall planting windows available.
When is turnip harvest season in Santa Rosa?
Expect the first turnip harvest in Santa Rosa around April 5, with harvest continuing through April 30. This is based on 35–60 days from transplant or direct sow. A fall crop planted September 15–25 adds a second harvest around October 20.
How long does it take to grow turnip in Santa Rosa, CA?
From transplant or direct sow to first harvest, turnip takes 35–60 days in Santa Rosa's climate. Based on a typical planting date of March 1–11, expect your first harvest around April 5. Santa Rosa's Zone 6b transition-zone climate produces maturity times right in the middle of the stated range.
What soil does turnip need in Santa Rosa?
Santa Rosa's soil conditions vary block by block. Before planting turnip, do a soil test (most state extension offices run them for $15–30). The test reveals pH, key nutrient levels, and organic matter content, so you can amend appropriately rather than guessing. Generally, 2–3 inches of compost annually improves most soils for vegetable production.