📍 Saint Petersburg, FL · Zone 10b · Last frost Thursday, January 15, 2026
✏️ ChangeWhen to Plant Rosemary in Saint Petersburg, Florida (33708)
Location
Saint Petersburg, Florida
ZIP Code
33708
USDA Zone
10b
Last Frost
Thursday, January 15, 2026
📅 Your 2026 Planting Dates
Start Seeds Indoors
Thursday, November 6, 2025
Transplant Outdoors
Thursday, January 29, 2026
Based on last frost Thursday, January 15, 2026 · Zone 10b
Pro tip: Start Rosemary seeds indoors 10 weeks before your last frost date, then transplant outdoors around Thursday, January 29, 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 Saint Petersburg?
Get your seeds now so they're ready by Thursday, November 6, 2025.
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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 Saint Petersburg, Florida? +
In Saint Petersburg (Zone 10b), start Rosemary seeds indoors around Thursday, November 6, 2025 and transplant outdoors around Thursday, January 29, 2026.
What is the last frost date for Saint Petersburg, Florida? +
The average last spring frost date for Saint Petersburg, Florida (ZIP 33708) is around Thursday, January 15, 2026. This is based on NOAA climate normals for USDA Zone 10b.
How long does Rosemary take to grow? +
Rosemary typically matures in about 120 days from transplanting. In Saint Petersburg, that means you can expect harvest around Thursday, January 29, 2026 plus 120 days.
Should I start Rosemary indoors or direct sow in Florida? +
Rosemary should be started indoors 10 weeks before your last frost date. In Saint Petersburg, that means starting around Thursday, November 6, 2025.
📚 More Rosemary Planting Guides
Other Plants for Saint Petersburg
Growing Rosemary in Zone 10b
Rosemary (Salvia rosmarinus) is a popular garden vegetable. In Saint Petersburg, Florida, which is in USDA Hardiness Zone 10b, you should start seeds indoors around Thursday, November 6, 2025.
Your average last frost date is Thursday, January 15, 2026. Plan to transplant your Rosemary seedlings outdoors around Thursday, January 29, 2026, about 2 weeks after your last frost date.