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🧅 Growing Onion in Zone 7a
Zone 7a has mild winters and a long growing season — good conditions for Onion. Last frost: Apr 15. First frost: Oct 22.
Planting Calendar
Season: Apr 15 – Oct 22 (190 days)
When to Plant Onion in Zone 7a
Start Seeds Indoors: Feb 4
Start 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 Onion seedlings outdoors after Mar 18. Wait until soil temperature reaches 45°F. Space plants at 9/sqft (4" apart). 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).
Companion Planting
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 Onion in Zone 7a?
Start 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 7a?
The average last spring frost date for Zone 7a is Apr 15. The first fall frost averages Oct 22, giving a 190-day growing season.
Can I grow Onion in Zone 7a?
Yes. Onion needs 110 days to harvest. Zone 7a has a 190-day growing season, which is sufficient.
What is the best month to plant Onion in Zone 7a?
The best time to start Onion in Zone 7a is Feb. Begin seeds indoors around Feb 4, then transplant outdoors after the last frost date of Apr 15.
What companion plants grow well with Onion?
Good companion plants for Onion include Strawberries, Cabbage, Beets, Lettuce, Carrots, Tomatoes. Avoid planting Onion near Beans, Peas.
How long does Onion take to harvest?
Onion takes approximately 110 days from planting to harvest. In Zone 7a, expect your first harvest around Jun 6.
Plan Your Onion Garden
Track Onion from seed to harvest with personalized frost dates, watering recommendations, and companion planting visualization.
Start Free Onion Growing Guide