Growing Calendula in Zone 1a
Zone 1a has harsh winters and a short growing season. Start Calendula early indoors to maximize your harvest window. Last frost: May 25. First frost: Aug 28.
Planting Calendar
Season: May 25 – Aug 28 (95 days)
When to Plant Calendula in Zone 1a
Start Seeds Indoors: Apr 13
Start Calendula seeds indoors around Apr 13 (6 weeks before last frost). Optimal germination temperature: 65°F. Germinates in 7–14 days.
Transplant Outdoors: May 11
Transplant Calendula seedlings outdoors after May 11. Wait until soil temperature reaches 45°F. Space plants at 12/sqft. Harden off plants for a week before moving outside.
Harvest: Jun 20
First harvest approximately Jun 20 (~40 days from transplant). Continue harvesting until first frost (Aug 28).
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 1a?
Start Calendula seeds indoors around Apr 13. Transplant outdoors after May 11. Expect first harvest around Jun 20.
What is the last frost date for Zone 1a?
The average last spring frost date for Zone 1a is May 25. The first fall frost averages Aug 28, giving a 95-day growing season.
Can I grow Calendula in Zone 1a?
Yes. Calendula needs 55 days to harvest. Zone 1a has a 95-day growing season, which is sufficient.
What is the best month to plant Calendula in Zone 1a?
The best time to start Calendula in Zone 1a is Apr. Begin seeds indoors around Apr 13, then transplant outdoors after the last frost date of May 25.
How long does Calendula take to harvest?
Calendula takes approximately 55 days from planting to harvest. In Zone 1a, expect your first harvest around Jun 20.
Plan Your Calendula Garden
Track Calendula from seed to harvest with personalized frost dates, watering recommendations, and companion planting visualization.
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