Growing Welsh Onion in Zone 6a
Zone 6a has mild winters and a long growing season — good conditions for Welsh Onion. Last frost: Apr 28. First frost: Oct 8.
Planting Calendar
Season: Apr 28 – Oct 8 (163 days)
When to Plant Welsh Onion in Zone 6a
Start Seeds Indoors: Feb 17
Start Welsh Onion seeds indoors around Feb 17 (10 weeks before last frost). Optimal germination temperature: 70°F. Germinates in 7–14 days.
Transplant Outdoors: Mar 31
Transplant Welsh Onion seedlings outdoors after Mar 31. Wait until soil temperature reaches 45°F. Space plants at 6/sqft. Harden off plants for a week before moving outside.
Harvest: Jun 19
First harvest approximately Jun 19 (~80 days from transplant). Continue harvesting until first frost (Oct 8).
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 6a?
Start Welsh Onion seeds indoors around Feb 17. Transplant outdoors after Mar 31. Expect first harvest around Jun 19.
What is the last frost date for Zone 6a?
The average last spring frost date for Zone 6a is Apr 28. The first fall frost averages Oct 8, giving a 163-day growing season.
Can I grow Welsh Onion in Zone 6a?
Yes. Welsh Onion needs 60 days to harvest. Zone 6a has a 163-day growing season, which is sufficient.
What is the best month to plant Welsh Onion in Zone 6a?
The best time to start Welsh Onion in Zone 6a is Feb. Begin seeds indoors around Feb 17, then transplant outdoors after the last frost date of Apr 28.
How long does Welsh Onion take to harvest?
Welsh Onion takes approximately 60 days from planting to harvest. In Zone 6a, expect your first harvest around Jun 19.
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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