When to Plant Cabbage in Rancho Cucamonga, CA
Published: April 24, 2026
Cabbage Planting Dates for Rancho Cucamonga, CA
| Start seeds indoors | November 27–December 4 |
| Last frost (average) | January 15 |
| Transplant outdoors | December 25–January 4 |
| Minimum soil temperature | 45°F |
| Expect first harvest | February 23 – April 4 |
| Fall crop planting | October 8–18 |
| Fall crop harvest | December 7 |
| First fall frost (average) | December 31 |
⚠ 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 Rancho Cucamonga, CA
Consult a Rancho Cucamonga-area nursery or your state extension office for cabbage varieties proven in Zone 9b.
Growing Cabbage in Rancho Cucamonga
Rancho Cucamonga sits in Zone 9b, with an average last frost of January 15 and first fall frost around December 31 — giving a 350-day frost-free growing season. Cool-season crops like cabbage benefit from Rancho Cucamonga'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 Rancho Cucamonga's warm climate, cabbage 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 Rancho Cucamonga, not April through June.
Rancho Cucamonga'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 Rancho Cucamonga.
Cabbage Calendar for Rancho Cucamonga
| Month | Task |
|---|---|
| November | Start seeds indoors under grow lights |
| January | Last frost — harden off seedlings outdoors |
| December | Transplant outdoors 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 |
Cabbage Tips for Rancho Cucamonga 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.
- •Plant cool-season cabbage in Rancho Cucamonga during October through February — spring plantings bolt before producing a usable crop in warm zones.
Common Cabbage Pests in Rancho Cucamonga
- •Cabbage Worm — peaks June–August in Zone 9b (active March–October); green caterpillars on brassicas; apply Bt spray or use row covers.
- •Cabbage Looper — peaks June–August in Zone 9b (active March–October); loop-walking green caterpillars; Bt spray works well.
- •Aphid — peaks June–August in Zone 9b (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 Cabbage in Rancho Cucamonga
In Rancho Cucamonga's warm 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. Warm-climate gardeners especially benefit from dense, layered companion plantings that shade soil and reduce water loss.
Frequently Asked Questions
When should I plant cabbage in Rancho Cucamonga, CA?
In Rancho Cucamonga (Zone 9b), start cabbage seeds indoors around November 27–December 4 and transplant outdoors around December 25–January 4. The city's average last frost of January 15 is the anchor date — count 7 weeks back for seed starting and 3 weeks back for transplanting.
What zone is Rancho Cucamonga, CA for cabbage growing?
Rancho Cucamonga is USDA Zone 9b. For cabbage, this means a frost-free growing season of roughly 50 weeks running from January 15 to December 31. Cool-season crops like cabbage thrive in this zone with both spring and fall planting windows available.
When is cabbage harvest season in Rancho Cucamonga?
Expect the first cabbage harvest in Rancho Cucamonga around February 23, with harvest continuing through April 4. This is based on 60–100 days from transplant or direct sow. A fall crop planted October 8–18 adds a second harvest around December 7.
How long does it take to grow cabbage in Rancho Cucamonga, CA?
From transplant or direct sow to first harvest, cabbage takes 60–100 days in Rancho Cucamonga's climate. Based on a typical planting date of December 25–January 4, expect your first harvest around February 23. Rancho Cucamonga's warm Zone 9b climate tends toward the faster end of this range — warmer soil and longer days accelerate maturity.
What soil does cabbage need in Rancho Cucamonga?
Rancho Cucamonga'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.