When should I plant Green Onion in Zone 12a?

Start Green Onion seeds indoors around Nov 20. Transplant outdoors after Dec 18. Expect first harvest around Jan 27.

What is the last frost date for Zone 12a?

The average last spring frost date for Zone 12a is Jan 1. The first fall frost averages Dec 31, giving a 364-day growing season.

Can I grow Green Onion in Zone 12a?

Yes. Green Onion needs 65 days to harvest. Zone 12a has a 364-day growing season, which is sufficient. You can plant up to 14 successions.

Growing Green Onion in Zone 12a

Zone 12a has a year-round growing season. Green Onion can be planted almost any time with proper planning. Last frost: Jan 1. First frost: Dec 31.

Planting Calendar

Indoor

Outdoor

Harvest

Nov 20Dec 31

Season: Jan 1 – Dec 31 (364 days) · Succession: plant every 3 weeks (up to 14x)

Zone12a

Last FrostJan 1

First FrostDec 31

Season Length364 days

Days to Harvest65

Sunfull-to-part

Frost ToleranceHeavy

Spacing16/sqft (3" apart)

When to Plant Green Onion in Zone 12a

Start Seeds Indoors: Nov 20

Start Green Onion seeds indoors around Nov 20 (6 weeks before last frost). Optimal germination temperature: 65°F. Germinates in 7–14 days.

Transplant Outdoors: Dec 18

Transplant Green Onion seedlings outdoors after Dec 18. Wait until soil temperature reaches 40°F. Space plants at 16/sqft (3" apart). Harden off plants for a week before moving outside.

Harvest: Jan 27

First harvest approximately Jan 27 (~40 days from transplant). Continue harvesting until first frost (Dec 31). Green Onion can overwinter in mild climates for continued harvest.

Fall Planting: Nov 5

For a fall harvest, plant Green Onion around Nov 5 (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

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