When to Plant Rosemary in USDA Zone 10b
Your June game plan for Zone 10b
Your garden in Zone 10b is working on a schedule, even when you're not. Here's where you should be this June.
-
Start harvesting rosemary
Check every 1–2 days. Many of these get tough or go to seed if you wait too long.
July prep starts now
- First harvests: rosemary
Rosemary is an aromatic evergreen shrub with needle-like leaves and a piney, citrus flavor. It is a Mediterranean herb that thrives in warm, dry conditions.
In Zone 10b, the average last spring frost is around January 1 and the first fall frost is around December 31, giving you a growing season of approximately 364 days.
Rosemary Planting Timeline — Zone 10b
Where Is USDA Zone 10b?
The map below highlights the states that contain Zone 10b. Click any state to see the Rosemary planting schedule for that location.
Rosemary Planting Calendar — Zone 10b
| Activity | When | Date Range |
|---|---|---|
| Transplant Outdoors | January 8 | Jan 8 – Jan 22 |
| Harvest | April 2 | Apr 2 – Aug 20 |
Plant 0.5" deep · 8" apart · Rows 12" apart
Month-by-Month Timeline
| Month | Activities |
|---|---|
| January | Transplant Outdoors |
| February | — |
| March | — |
| April | Harvest |
| May | Harvest |
| June | Harvest |
| July | Harvest |
| August | Harvest |
| September | — |
| October | — |
| November | — |
| December | — |
Free Zone 10b Planting Calendar PDF
Know exactly when to plant every crop in your zone. Get a printable month-by-month calendar customized for Zone 10b with start dates, transplant windows, and harvest times.
Growing Conditions
Sun
Full Sun (6-8+ hours)
💧 Water
0.3"/week · Low — drought tolerant
Days to Maturity
80–180 days
Soil pH
6 – 7.5
Zone Temperature Range
35°F to 40°F average annual minimum
Growing Season
365 days (Zone 10b average)
Planting Specifications
| Planting Depth | 0.5 inches |
| Plant Spacing | 8 inches apart |
| Row Spacing | 12 inches between rows |
Succession Planting Rosemary in Zone 10b
Sow every 9.1 weeks for continuous harvest throughout the season.
Growing Tips for Rosemary in Zone 10b
Zone 10b offers a long growing season (~365 days). You can plant Rosemary earlier and may get multiple harvests.
Grow in well-drained soil and avoid overwatering. In cold climates, grow in containers and bring indoors for winter. Propagate from stem cuttings for faster results than seed.
Companion Planting
Good Companions
The Gardener's Encyclopedia to Companion Planting
The pairings that make vegetables, herbs, and flowers grow better — and the ones that quietly wreck a bed.
- Proven pairings for 200+ vegetables, herbs, flowers, and fruits
- Full seed-starting + planting schedule with timing and spacing
- Bonus: square-foot gardening guide + printable seasonal planners
Saving Rosemary Seeds
Recommended for Your Garden
Reduce heat stress and sun scorch in hot climates with UV-stabilized shade cloth.
Breathable fabric pots that promote healthy root growth and prevent overwatering.
Built-in reservoir keeps herbs and greens consistently watered with less effort.
Related Plants
Rosemary in Other Zones
Rosemary by State
- Alabama
- Alaska
- Arizona
- Arkansas
- California
- Colorado
- Connecticut
- Delaware
- Florida
- Georgia
- Hawaii
- Idaho
- Illinois
- Indiana
- Iowa
- Kansas
- Kentucky
- Louisiana
- Maine
- Maryland
- Massachusetts
- Michigan
- Minnesota
- Mississippi
- Missouri
- Montana
- Nebraska
- Nevada
- New Hampshire
- New Jersey
- New Mexico
- New York
- North Carolina
- North Dakota
- Ohio
- Oklahoma
- Oregon
- Pennsylvania
- Rhode Island
- South Carolina
- South Dakota
- Tennessee
- Texas
- Utah
- Vermont
- Virginia
- Washington
- West Virginia
- Wisconsin
- Wyoming
Frequently Asked Questions
When should I plant Rosemary in Zone 10b?
In Zone 10b, plan your Rosemary planting around the average last frost date of January 1. Transplant seedlings around January 8.
Can Rosemary grow in Zone 10b?
Yes, Rosemary can grow well in Zone 10b, hardy in USDA zones 7a through 10b. Zone 10b has a growing season of approximately 364 days, which is sufficient for Rosemary (80-180 days to maturity).
When can I harvest Rosemary in Zone 10b?
In Zone 10b, expect to harvest Rosemary from April 2 – August 20. Rosemary takes 80-180 days from planting to harvest.
What is the last frost date for Zone 10b?
The average last spring frost in Zone 10b is around January 1, and the first fall frost is around December 31. This gives a growing season of approximately 364 days. These are 50% probability dates — actual frost dates vary year to year.
What should I plant next to Rosemary?
Good companion plants for Rosemary include Sage, Thyme, Lavender, Carrots. These companions can help with pest control, pollination, and nutrient sharing.
Your Zone 10b Garden Planner — Free
A 22-page printable planner tailored to Zone 10b. Planting dates, monthly task lists, harvest log, seed inventory, and succession charts — everything you need to plan a full season.