📍 South Acworth, NH · Zone 5b · Last frost Saturday, April 25, 2026
✏️ ChangeWhen to Plant Rosemary in South Acworth, New Hampshire (03607)
Location
South Acworth, New Hampshire
ZIP Code
03607
USDA Zone
5b
Last Frost
Saturday, April 25, 2026
📅 Your 2026 Planting Dates
Start Seeds Indoors
Saturday, February 14, 2026
Transplant Outdoors
Saturday, May 9, 2026
Based on last frost Saturday, April 25, 2026 · Zone 5b
Pro tip: Start Rosemary seeds indoors 10 weeks before your last frost date, then transplant outdoors around Saturday, May 9, 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 South Acworth?
Get your seeds now so they're ready by Saturday, February 14, 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 South Acworth, New Hampshire? +
In South Acworth (Zone 5b), start Rosemary seeds indoors around Saturday, February 14, 2026 and transplant outdoors around Saturday, May 9, 2026.
What is the last frost date for South Acworth, New Hampshire? +
The average last spring frost date for South Acworth, New Hampshire (ZIP 03607) is around Saturday, April 25, 2026. This is based on NOAA climate normals for USDA Zone 5b.
How long does Rosemary take to grow? +
Rosemary typically matures in about 120 days from transplanting. In South Acworth, that means you can expect harvest around Saturday, May 9, 2026 plus 120 days.
Should I start Rosemary indoors or direct sow in New Hampshire? +
Rosemary should be started indoors 10 weeks before your last frost date. In South Acworth, that means starting around Saturday, February 14, 2026.
Other Plants for South Acworth
Growing Rosemary in Zone 5b
Rosemary (Salvia rosmarinus) is a popular garden vegetable. In South Acworth, New Hampshire, which is in USDA Hardiness Zone 5b, you should start seeds indoors around Saturday, February 14, 2026.
Your average last frost date is Saturday, April 25, 2026. Plan to transplant your Rosemary seedlings outdoors around Saturday, May 9, 2026, about 2 weeks after your last frost date.