Growing Welsh Onion in Zone 6b
Zone 6b has mild winters and a long growing season — good conditions for Welsh Onion. Last frost: Apr 15. First frost: Oct 22.
Planting Calendar
Season: Apr 15 – Oct 22 (190 days)
When to Plant Welsh Onion in Zone 6b
Start Seeds Indoors: Feb 4
Start Welsh Onion seeds indoors around Feb 4 (10 weeks before last frost). Optimal germination temperature: 70°F. Germinates in 7–14 days.
Transplant Outdoors: Mar 18
Transplant Welsh Onion seedlings outdoors after Mar 18. Wait until soil temperature reaches 45°F. Space plants at 6/sqft. Harden off plants for a week before moving outside.
Harvest: Jun 6
First harvest approximately Jun 6 (~80 days from transplant). Continue harvesting until first frost (Oct 22).
Welsh 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 13bFrequently Asked Questions
When should I plant Welsh Onion in Zone 6b?
Start Welsh Onion seeds indoors around Feb 4. Transplant outdoors after Mar 18. Expect first harvest around Jun 6.
What is the last frost date for Zone 6b?
The average last spring frost date for Zone 6b is Apr 15. The first fall frost averages Oct 22, giving a 190-day growing season.
Can I grow Welsh Onion in Zone 6b?
Yes. Welsh Onion needs 60 days to harvest. Zone 6b has a 190-day growing season, which is sufficient.
What is the best month to plant Welsh Onion in Zone 6b?
The best time to start Welsh Onion in Zone 6b is Feb. Begin seeds indoors around Feb 4, then transplant outdoors after the last frost date of Apr 15.
How long does Welsh Onion take to harvest?
Welsh Onion takes approximately 60 days from planting to harvest. In Zone 6b, expect your first harvest around Jun 6.
Plan Your Welsh Onion Garden
Track Welsh Onion from seed to harvest with personalized frost dates, watering recommendations, and companion planting visualization.
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