Growing Zinnia in Zone 7b
Zone 7b has mild winters and a long growing season — good conditions for Zinnia. Last frost: Apr 10. First frost: Nov 7.
Planting Calendar
Season: Apr 10 – Nov 7 (211 days)
When to Plant Zinnia in Zone 7b
Start Seeds Indoors: Mar 13
Start Zinnia seeds indoors around Mar 13 (4 weeks before last frost). Optimal germination temperature: 75°F. Germinates in 5–10 days.
Transplant Outdoors: Apr 24
Transplant Zinnia seedlings outdoors after Apr 24. Wait until soil temperature reaches 60°F. Space plants at 8/sqft. Harden off plants for a week before moving outside.
Harvest: Jun 13
First harvest approximately Jun 13 (~50 days from transplant). Continue harvesting until first frost (Nov 7).
Zinnia 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 Zinnia in Zone 7b?
Start Zinnia seeds indoors around Mar 13. Transplant outdoors after Apr 24. Expect first harvest around Jun 13.
What is the last frost date for Zone 7b?
The average last spring frost date for Zone 7b is Apr 10. The first fall frost averages Nov 7, giving a 211-day growing season.
Can I grow Zinnia in Zone 7b?
Yes. Zinnia needs 60 days to harvest. Zone 7b has a 211-day growing season, which is sufficient.
What is the best month to plant Zinnia in Zone 7b?
The best time to start Zinnia in Zone 7b is Mar. Begin seeds indoors around Mar 13, then transplant outdoors after the last frost date of Apr 10.
How long does Zinnia take to harvest?
Zinnia takes approximately 60 days from planting to harvest. In Zone 7b, expect your first harvest around Jun 13.
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