Growing Fennel in Zone 10b

Zone 10b has a year-round growing season. Fennel can be planted almost any time with proper planning. Last frost: Jan 28. First frost: Dec 22.

Planting Calendar

Indoor

Outdoor

Harvest

Dec 31Dec 22

Season: Jan 28 – Dec 22 (328 days) · Succession: plant every 3 weeks (up to 12x)

Zone10b

Last FrostJan 28

First FrostDec 22

Season Length328 days

Days to Harvest65

SunFull Sun

Frost ToleranceLight

Spacing12/sqft

When to Plant Fennel in Zone 10b

Start Seeds Indoors: Dec 31

Start Fennel seeds indoors around Dec 31 (4 weeks before last frost). Optimal germination temperature: 65°F. Germinates in 7–14 days.

Transplant Outdoors: Jan 21

Transplant Fennel seedlings outdoors after Jan 21. Wait until soil temperature reaches 50°F. Space plants at 12/sqft. Harden off plants for a week before moving outside.

Harvest: Mar 17

First harvest approximately Mar 17 (~55 days from transplant). Continue harvesting until first frost (Dec 22).

Fall Planting: Oct 13

For a fall harvest, plant Fennel around Oct 13 (10 weeks before first frost).

Companion Planting

✅ Dill

❌ Tomatoes❌ Peppers❌ Beans❌ Eggplant❌ Kohlrabi

Fennel in Other Zones

1a 1b 2a 2b 3a 3b 4a 4b 5a 5b 6a 6b 7a 7b 8a 8b 9a 9b 10a 10b 11a 11b 12a 12b 13a 13b

Frequently Asked Questions

When should I plant Fennel in Zone 10b?

Start Fennel seeds indoors around Dec 31. Transplant outdoors after Jan 21. Expect first harvest around Mar 17.

What is the last frost date for Zone 10b?

The average last spring frost date for Zone 10b is Jan 28. The first fall frost averages Dec 22, giving a 328-day growing season.

Can I grow Fennel in Zone 10b?

Yes. Fennel needs 65 days to harvest. Zone 10b has a 328-day growing season, which is sufficient. You can plant up to 12 successions.

What is the best month to plant Fennel in Zone 10b?

The best time to start Fennel in Zone 10b is Dec. Begin seeds indoors around Dec 31, then transplant outdoors after the last frost date of Jan 28.

What companion plants grow well with Fennel?

Good companion plants for Fennel include Dill. Avoid planting Fennel near Tomatoes, Peppers, Beans, Eggplant.

How long does Fennel take to harvest?

Fennel takes approximately 65 days from planting to harvest. In Zone 10b, expect your first harvest around Mar 17.

Plan Your Fennel Garden

Track Fennel from seed to harvest with personalized frost dates, watering recommendations, and companion planting visualization.

Start Free Fennel Growing Guide