When should I plant Rosemary in Zone 1b?

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 1b?

The average last spring frost date for Zone 1b is May 25. The first fall frost averages Aug 28, giving a 95-day growing season.

Can I grow Rosemary in Zone 1b?

Yes. Rosemary needs 90 days to harvest. Zone 1b has a 95-day growing season, which is sufficient.

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🌿 Growing Rosemary in Zone 1b

Zone 1b 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

Indoor

Outdoor

Harvest

Mar 16Aug 28

Season: May 25 – Aug 28 (95 days)

Zone1b

Last FrostMay 25

First FrostAug 28

Season Length95 days

Days to Harvest90

SunFull Sun

Frost ToleranceLight

Spacing1/sqft (12" apart)

When to Plant Rosemary in Zone 1b

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

✅ Beans✅ Carrots✅ Cabbage

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 13b

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