Growing Green Onion in Zone 9a

Zone 9a has warm winters and an extended growing season — excellent for heat-loving crops like Green Onion. Last frost: Mar 20. First frost: Nov 12.

Planting Calendar

Indoor

Outdoor

Harvest

Feb 6Nov 12

Season: Mar 20 – Nov 12 (237 days) · Succession: plant every 3 weeks (up to 8x)

Zone9a

Last FrostMar 20

First FrostNov 12

Season Length237 days

Days to Harvest65

Sunfull-to-part

Frost ToleranceHeavy

Spacing16/sqft (3" apart)

When to Plant Green Onion in Zone 9a

Start Seeds Indoors: Feb 6

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

Transplant Outdoors: Mar 6

Transplant Green Onion seedlings outdoors after Mar 6. 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 15

First harvest approximately Apr 15 (~40 days from transplant). Continue harvesting until first frost (Nov 12). Green Onion can overwinter in mild climates for continued harvest.

Fall Planting: Sep 17

For a fall harvest, plant Green Onion around Sep 17 (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 9a?

Start Green Onion seeds indoors around Feb 6. Transplant outdoors after Mar 6. Expect first harvest around Apr 15.

What is the last frost date for Zone 9a?

The average last spring frost date for Zone 9a is Mar 20. The first fall frost averages Nov 12, giving a 237-day growing season.

Can I grow Green Onion in Zone 9a?

Yes. Green Onion needs 65 days to harvest. Zone 9a has a 237-day growing season, which is sufficient. You can plant up to 8 successions.

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

The best time to start Green Onion in Zone 9a is Feb. Begin seeds indoors around Feb 6, then transplant outdoors after the last frost date of Mar 20.

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 9a, expect your first harvest around Apr 15.

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