When should I plant Rosemary in Zone 4a?

Start Rosemary seeds indoors around Peb 24. Transplant outdoors after May 12. Expect first harvest around Ago 10.

What is the last frost date for Zone 4a?

The average last spring frost date for Zone 4a is May 5. The first fall frost averages Okt 1, giving a 149-day growing season.

Can I grow Rosemary in Zone 4a?

Yes. Rosemary needs 90 days to harvest. Zone 4a has a 149-day growing season, which is sufficient.

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🌿 Growing Rosemary in Zone 4a

Zone 4a has cold winters and a moderate growing season. Timing is key for Rosemary in this zone. Huling frost: May 5. Unang frost: Okt 1.

Planting Calendar

Indoor

Outdoor

Harvest

Peb 24Okt 1

Season: May 5 – Okt 1 (149 araw)

Zone4a

Huling frostMay 5

Unang frostOkt 1

Season149 araw

Ani90 araw

ArawBuong Araw

When to Plant Rosemary in Zone 4a

Start Seeds Indoors: Peb 24

Start Rosemary seeds indoors around Peb 24 (10 linggo bago ang huling hamog). Optimal germination temperature: 70F. Germinates in 14-28 days.

Transplant Outdoors: May 12

Transplant Rosemary seedlings outdoors after May 12. Wait until soil temperature reaches 55F. Space plants at 1/m² (30cm pagitan). Harden off plants for a week before moving outside.

Harvest: Ago 10

First harvest approximately Ago 10 (~90 araw from transplant). Continue harvesting until first frost (Okt 1). Rosemary can overwinter in mild climates for continued harvest.

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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 Garden Rosemary

Track Rosemary from seed to harvest with personalized frost dates, watering recommendations, and companion planting visualization.

Start Free Rosemary Growing Guide