📍 Chase Mills, NY · Zone 4b · Last frost Tuesday, May 5, 2026
✏️ ChangeWhen to Plant Rosemary in Chase Mills, New York (13621)
Location
Chase Mills, New York
ZIP Code
13621
USDA Zone
4b
Last Frost
Tuesday, May 5, 2026
📅 Your 2026 Planting Dates
Start Seeds Indoors
Tuesday, February 24, 2026
Transplant Outdoors
Tuesday, May 19, 2026
Based on last frost Tuesday, May 5, 2026 · Zone 4b
Pro tip: Start Rosemary seeds indoors 10 weeks before your last frost date, then transplant outdoors around Tuesday, May 19, 2026.
🌿 Plant Details
☀️ Growing Requirements
☀️
Sun
Full Sun (6+ hours)
💧
Water
Low (drought tolerant)
↔️
Spacing
24" apart
🌱
Planting Depth
0.25" deep
Seeds typically germinate in 14-21 days
Ready to Plant Rosemary in Chase Mills?
Get your seeds now so they're ready by Tuesday, February 24, 2026.
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🤝 Good Companions
Full Companion Planting Guide for Rosemary
See which plants help Rosemary thrive, which to keep away, and raised bed layout tips →
🛠️ Supplies You'll Need
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Common Rosemary Varieties
Popular cultivars to look for at your local nursery or seed supplier.
Tuscan Blue
Vigorous upright rosemary with large, intensely fragrant leaves — excellent for cooking.
Arp
One of the most cold-hardy rosemaries, surviving to Zone 6 with protection.
Blue Spires
Tall, upright variety with blue-toned flowers; fragrant and great for hedges.
Prostrate (Irene)
Low-growing trailing rosemary that cascades over walls and containers beautifully.
🌾 Seed Saving Guide
🟡 ModerateWhen to Harvest Seed
Collect seeds from dried flower clusters in late summer after flowering.
Processing
Strip dried flower clusters, separate seeds from chaff. Surface sow — seeds need light to germinate.
Seed Viability
Up to 2 years when stored cool, dark, and dry.
Pro Tip
Rosemary seed germination rates are low (20–30%). Stem cuttings give far more reliable results.
Raised Bed Planting Guides
A 4×8 bed fits 8 plants of Rosemary. See plant counts, spacing grids, and companion pairings for every bed size →
Frequently Asked Questions
When should I plant Rosemary in Chase Mills, New York? +
In Chase Mills (Zone 4b), start Rosemary seeds indoors around Tuesday, February 24, 2026 and transplant outdoors around Tuesday, May 19, 2026.
What is the last frost date for Chase Mills, New York? +
The average last spring frost date for Chase Mills, New York (ZIP 13621) is around Tuesday, May 5, 2026. This is based on NOAA climate normals for USDA Zone 4b.
How long does Rosemary take to grow? +
Rosemary typically matures in about 120 days from transplanting. In Chase Mills, that means you can expect harvest around Tuesday, May 19, 2026 plus 120 days.
Should I start Rosemary indoors or direct sow in New York? +
Rosemary should be started indoors 10 weeks before your last frost date. In Chase Mills, that means starting around Tuesday, February 24, 2026.
📚 More Rosemary Planting Guides
Other Plants for Chase Mills
Growing Rosemary in Zone 4b
Rosemary (Salvia rosmarinus) is a popular garden vegetable. In Chase Mills, New York, which is in USDA Hardiness Zone 4b, you should start seeds indoors around Tuesday, February 24, 2026.
Your average last frost date is Tuesday, May 5, 2026. Plan to transplant your Rosemary seedlings outdoors around Tuesday, May 19, 2026, about 2 weeks after your last frost date.