Growing Green Onion in Zone 9b

Zone 9b has warm winters and an extended growing season — excellent for heat-loving crops like Green Onion. Last frost: Mar 10. First frost: Nov 15.

Planting Calendar

Indoor

Outdoor

Harvest

Jan 27Nov 15

Season: Mar 10 – Nov 15 (250 days) · Succession: plant every 3 weeks (up to 8x)

Zone9b

Last FrostMar 10

First FrostNov 15

Season Length250 days

Days to Harvest65

Sunfull-to-part

Frost ToleranceHeavy

Spacing16/sqft (3" apart)

When to Plant Green Onion in Zone 9b

Start Seeds Indoors: Jan 27

Start Green Onion seeds indoors around Jan 27 (6 weeks before last frost). Optimal germination temperature: 65°F. Germinates in 7–14 days.

Transplant Outdoors: Feb 24

Transplant Green Onion seedlings outdoors after Feb 24. Wait until soil temperature reaches 40°F. Space plants at 16/sqft (3" apart). Harden off plants for a week before moving outside.

Harvest: Apr 5

First harvest approximately Apr 5 (~40 days from transplant). Continue harvesting until first frost (Nov 15). Green Onion can overwinter in mild climates for continued harvest.

Fall Planting: Sep 20

For a fall harvest, plant Green Onion around Sep 20 (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 9b?

Start Green Onion seeds indoors around Jan 27. Transplant outdoors after Feb 24. Expect first harvest around Apr 5.

What is the last frost date for Zone 9b?

The average last spring frost date for Zone 9b is Mar 10. The first fall frost averages Nov 15, giving a 250-day growing season.

Can I grow Green Onion in Zone 9b?

Yes. Green Onion needs 65 days to harvest. Zone 9b has a 250-day growing season, which is sufficient. You can plant up to 8 successions.

What is the best month to plant Green Onion in Zone 9b?

The best time to start Green Onion in Zone 9b is Jan. Begin seeds indoors around Jan 27, then transplant outdoors after the last frost date of Mar 10.

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 9b, expect your first harvest around Apr 5.

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