Growing Green Onion in Zone 10b

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

Planting Calendar

Indoor

Outdoor

Harvest

Dec 17Dec 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-to-part

Frost ToleranceHeavy

Spacing16/sqft (3" apart)

When to Plant Green Onion in Zone 10b

Start Seeds Indoors: Dec 17

Start Green Onion seeds indoors around Dec 17 (6 weeks before last frost). Optimal germination temperature: 65°F. Germinates in 7–14 days.

Transplant Outdoors: Jan 14

Transplant Green Onion seedlings outdoors after Jan 14. Wait until soil temperature reaches 40°F. Space plants at 16/sqft (3" apart). Harden off plants for a week before moving outside.

Harvest: Feb 23

First harvest approximately Feb 23 (~40 days from transplant). Continue harvesting until first frost (Dec 22). Green Onion can overwinter in mild climates for continued harvest.

Fall Planting: Oct 27

For a fall harvest, plant Green Onion around Oct 27 (8 weeks before first frost).

Companion Planting

✅ Carrot ✅ Beet ✅ Lettuce ✅ Tomato✅ Pepper✅ Cabbage✅ Strawberries

❌ Bean❌ Pea

Green Onion 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 Green Onion in Zone 10b?

Start Green Onion seeds indoors around Dec 17. Transplant outdoors after Jan 14. Expect first harvest around Feb 23.

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 Green Onion in Zone 10b?

Yes. Green Onion 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 Green Onion in Zone 10b?

The best time to start Green Onion in Zone 10b is Dec. Begin seeds indoors around Dec 17, then transplant outdoors after the last frost date of Jan 28.

What companion plants grow well with Green Onion?

Good companion plants for Green Onion include Carrot, Beet, Lettuce, Tomato, Pepper, Cabbage. Avoid planting Green Onion near Bean, Pea.

How long does Green Onion take to harvest?

Green Onion takes approximately 65 days from planting to harvest. In Zone 10b, expect your first harvest around Feb 23.

Plan Your Green Onion Garden

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

Start Free Green Onion Growing Guide