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🌿 Growing Rosemary in Zone 1a
Zone 1a has harsh winters and a short growing season. Start Rosemary 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 Rosemary in Zone 1a
Start Seeds Indoors: Mar 16
Start Rosemary seeds indoors around Mar 16 (10 weeks before last frost). Optimal germination temperature: 70°F. Germinates in 14–28 days.
Transplant Outdoors: Jun 1
Transplant Rosemary seedlings outdoors after Jun 1. Wait until soil temperature reaches 55°F. Space plants at 1/sqft (12" apart). Harden off plants for a week before moving outside.
Harvest: Aug 30
First harvest approximately Aug 30 (~90 days from transplant). Continue harvesting until first frost (Aug 28). Rosemary can overwinter in mild climates for continued harvest.
Companion Planting
Rosemary 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 Rosemary in Zone 1a?
Start Rosemary seeds indoors around Mar 16. Transplant outdoors after Jun 1. Expect first harvest around Aug 30.
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 Rosemary in Zone 1a?
Yes. Rosemary needs 90 days to harvest. Zone 1a has a 95-day growing season, which is sufficient.
What is the best month to plant Rosemary in Zone 1a?
The best time to start Rosemary in Zone 1a is Mar. Begin seeds indoors around Mar 16, then transplant outdoors after the last frost date of May 25.
What companion plants grow well with Rosemary?
Good companion plants for Rosemary include Beans, Carrots, Cabbage.
How long does Rosemary take to harvest?
Rosemary takes approximately 90 days from planting to harvest. In Zone 1a, expect your first harvest around Aug 30.
Plan Your Rosemary Garden
Track Rosemary from seed to harvest with personalized frost dates, watering recommendations, and companion planting visualization.
Start Free Rosemary Growing Guide