When to Plant Cabbage in Santa Rosa, CA
Published: April 24, 2026
Cabbage Planting Dates for Santa Rosa, CA
| Start seeds indoors | February 1–8 |
| Last frost (average) | March 22 |
| Transplant outdoors | March 1–11 |
| Minimum soil temperature | 45°F |
| Expect first harvest | April 30 – June 9 |
| Fall crop planting | August 18–28 |
| Fall crop harvest | October 17 |
| First fall frost (average) | November 10 |
⚠ Start cabbage indoors 6–8 weeks before last frost. Transplant 2–4 weeks before last frost. Very frost tolerant — withstands temperatures as low as 20°F. Also plant in late summer for fall harvest.
Best Cabbage Varieties for Santa Rosa, CA
Consult a Santa Rosa-area nursery or your state extension office for cabbage varieties proven in Zone 6b.
Growing Cabbage 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 cabbage 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 cabbage 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 1.5 inches per week serves cabbage well across most soil types found in Santa Rosa.
Cabbage Calendar for Santa Rosa
| Month | Task |
|---|---|
| February | Start seeds indoors under grow lights |
| March | Transplant outdoors into warm soil |
| April | Expect first harvest window to open |
| August | Start fall crop — transplants or direct sow |
| November | First fall frost — harvest remaining, end of outdoor season |
Cabbage Tips for Santa Rosa Gardeners
- •Space plants 18 inches apart — crowding reduces head size and promotes fungal disease.
- •Side-dress with nitrogen 3–4 weeks after transplanting to support rapid leaf formation.
- •Succession plant cabbage in Santa Rosa every 2–3 weeks through spring to extend the harvest window into summer.
Common Cabbage Pests in Santa Rosa
- •Cabbage Worm — peaks July in Zone 6b (active May–September); green caterpillars on brassicas; apply Bt spray or use row covers.
- •Cabbage Looper — peaks July in Zone 6b (active May–September); loop-walking green caterpillars; Bt spray works well.
- •Aphid — 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 Cabbage in Santa Rosa
In Santa Rosa's moderate climate, Onion and Dill are the most beneficial plants to grow alongside cabbage. Onion deters carrot fly, aphids, and several root-zone pests through sulfur compounds. Keep cabbage away from Tomato — it competes for nutrients or shares pest pressure.
Frequently Asked Questions
When should I plant cabbage in Santa Rosa, CA?
In Santa Rosa (Zone 6b), start cabbage seeds indoors around February 1–8 and transplant outdoors around March 1–11. The city's average last frost of March 22 is the anchor date — count 7 weeks back for seed starting and 3 weeks back for transplanting.
What zone is Santa Rosa, CA for cabbage growing?
Santa Rosa is USDA Zone 6b. For cabbage, this means a frost-free growing season of roughly 33 weeks running from March 22 to November 10. Cool-season crops like cabbage thrive in this zone with both spring and fall planting windows available.
When is cabbage harvest season in Santa Rosa?
Expect the first cabbage harvest in Santa Rosa around April 30, with harvest continuing through June 9. This is based on 60–100 days from transplant or direct sow. A fall crop planted August 18–28 adds a second harvest around October 17.
How long does it take to grow cabbage in Santa Rosa, CA?
From transplant or direct sow to first harvest, cabbage takes 60–100 days in Santa Rosa's climate. Based on a typical planting date of March 1–11, expect your first harvest around April 30. Santa Rosa's Zone 6b transition-zone climate produces maturity times right in the middle of the stated range.
What soil does cabbage need in Santa Rosa?
Santa Rosa's soil conditions vary block by block. Before planting cabbage, 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.