When should I plant Green Onion in Zone 5a?

Start Green Onion seeds indoors around Mar 17. Transplant outdoors after Apr 14. Expect first harvest around May 24.

What is the last frost date for Zone 5a?

The average last spring frost date for Zone 5a is Apr 28. The first fall frost averages Oct 8, giving a 163-day growing season.

Can I grow Green Onion in Zone 5a?

Yes. Green Onion needs 65 days to harvest. Zone 5a has a 163-day growing season, which is sufficient. You can plant up to 4 successions.

Growing Green Onion in Zone 5a

Zone 5a has cold winters and a moderate growing season. Timing is key for Green Onion in this zone. Last frost: Apr 28. First frost: Oct 8.

Planting Calendar

Indoor

Outdoor

Harvest

Mar 17Oct 8

Season: Apr 28 – Oct 8 (163 days) · Succession: plant every 3 weeks (up to 4x)

Zone5a

Last FrostApr 28

First FrostOct 8

Season Length163 days

Days to Harvest65

Sunfull-to-part

Frost ToleranceHeavy

Spacing16/sqft (3" apart)

When to Plant Green Onion in Zone 5a

Start Seeds Indoors: Mar 17

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

Transplant Outdoors: Apr 14

Transplant Green Onion seedlings outdoors after Apr 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: May 24

First harvest approximately May 24 (~40 days from transplant). Continue harvesting until first frost (Oct 8). Green Onion can overwinter in mild climates for continued harvest.

Fall Planting: Aug 13

For a fall harvest, plant Green Onion around Aug 13 (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