Growing Calendula in Zone 3a
Zone 3a has harsh winters and a short growing season. Start Calendula early indoors to maximize your harvest window. Last frost: May 22. First frost: Sep 12.
Planting Calendar
Season: May 22 – Sep 12 (113 days)
When to Plant Calendula in Zone 3a
Start Seeds Indoors: Apr 10
Start Calendula seeds indoors around Apr 10 (6 weeks before last frost). Optimal germination temperature: 65°F. Germinates in 7–14 days.
Transplant Outdoors: May 8
Transplant Calendula seedlings outdoors after May 8. Wait until soil temperature reaches 45°F. Space plants at 12/sqft. Harden off plants for a week before moving outside.
Harvest: Jun 17
First harvest approximately Jun 17 (~40 days from transplant). Continue harvesting until first frost (Sep 12).
Calendula 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 Calendula in Zone 3a?
Start Calendula seeds indoors around Apr 10. Transplant outdoors after May 8. Expect first harvest around Jun 17.
What is the last frost date for Zone 3a?
The average last spring frost date for Zone 3a is May 22. The first fall frost averages Sep 12, giving a 113-day growing season.
Can I grow Calendula in Zone 3a?
Yes. Calendula needs 55 days to harvest. Zone 3a has a 113-day growing season, which is sufficient.
What is the best month to plant Calendula in Zone 3a?
The best time to start Calendula in Zone 3a is Apr. Begin seeds indoors around Apr 10, then transplant outdoors after the last frost date of May 22.
How long does Calendula take to harvest?
Calendula takes approximately 55 days from planting to harvest. In Zone 3a, expect your first harvest around Jun 17.
Plan Your Calendula Garden
Track Calendula from seed to harvest with personalized frost dates, watering recommendations, and companion planting visualization.
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