When to Plant Cosmos in USDA Zone 11b
What to do in June
Each item below is timed to Zone 11b's frost dates and soil temperatures. Skip nothing, stress about nothing.
-
Survive, don't thrive
June-August is endurance gardening. Keep okra, peppers, sweet potatoes, and southern peas alive. Harvest everything daily before the heat damages produce on the vine.
-
Start fall tomato seeds indoors
Yes, indoors — under lights or in AC. They'll be ready to transplant in August when temperatures briefly moderate.
-
Add compost to empty beds
Empty beds get a thick layer of compost + mulch to suppress weeds and feed the soil for fall planting.
Cosmos (Cosmos bipinnatus) is an airy, feathery-foliaged cottage garden annual from Mexico that thrives on neglect. It produces delicate daisy-like blooms in shades of pink, white, and magenta from midsummer until frost. Cosmos is a prolific self-sower — once established in a garden it often returns year after year without replanting. Excellent habitat plant for beneficial insects.
In Zone 11b, 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.
Cosmos Planting Timeline — Zone 11b
Where Is USDA Zone 11b?
The map below highlights the states that contain Zone 11b. Click any state to see the Cosmos planting schedule for that location.
Cosmos Planting Calendar — Zone 11b
| Activity | When | Date Range |
|---|---|---|
| Start Indoors | December 4 | Dec 4 – Dec 18 |
| Transplant Outdoors | October 30 | Oct 30 – Nov 13 |
| Direct Sow | October 30 | Oct 30 – Nov 20 |
| Bloom | January 8 | Jan 8 – Sep 3 |
Plant 0.3" deep · 12" apart · Rows 18" apart
Month-by-Month Timeline
| Month | Activities |
|---|---|
| January | Bloom |
| February | Bloom |
| March | Bloom |
| April | Bloom |
| May | Bloom |
| June | Bloom |
| July | Bloom |
| August | Bloom |
| September | Bloom |
| October | Transplant Outdoors Direct Sow |
| November | Transplant Outdoors Direct Sow |
| December | Start Indoors |
Free Zone 11b Planting Calendar PDF
Know exactly when to plant every crop in your zone. Get a printable month-by-month calendar customized for Zone 11b with start dates, transplant windows, and harvest times.
Growing Conditions
Sun
Full Sun (6-8+ hours)
💧 Water
Low — drought tolerant
Days to Maturity
60–90 days
Soil pH
6 – 8
Zone Temperature Range
45°F to 50°F average annual minimum
Growing Season
365 days (Zone 11b average)
Planting Specifications
| Planting Depth | 0.3 inches |
| Plant Spacing | 12 inches apart |
| Row Spacing | 18 inches between rows |
Succession Planting Cosmos in Zone 11b
Sow every 6.9 weeks for continuous harvest throughout the season.
Growing Tips for Cosmos in Zone 11b
Zone 11b offers a long growing season (~365 days). You can plant Cosmos earlier and may get multiple harvests.
Direct-sow after last frost; cosmos germinates readily at 65-80°F in 7-10 days. Avoid rich soil — excess fertility produces lush foliage at the expense of blooms. Cosmos tolerates poor, dry soil exceptionally well. Pinch seedlings at 8 inches to encourage branching. Self-sows freely; allow some seed heads to mature and drop for a no-fuss perennial effect in warm climates.
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 Cosmos Seeds
Recommended for Your Garden
Reduce heat stress and sun scorch in hot climates with UV-stabilized shade cloth.
Start seeds indoors with reusable cell trays and humidity domes.
Test your soil pH, nitrogen, phosphorus, and potassium levels before planting.
Related Plants
Cosmos in Other Zones
Cosmos 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 Cosmos in Zone 11b?
In Zone 11b, plan your Cosmos planting around the average last frost date of January 1. Start seeds indoors around December 4. Direct sow outdoors around October 30. Transplant seedlings around October 30.
Can Cosmos grow in Zone 11b?
Yes, Cosmos can grow well in Zone 11b, hardy in USDA zones 2a through 11b. Zone 11b has a growing season of approximately 364 days, which is sufficient for Cosmos (60-90 days to maturity).
When can I harvest Cosmos in Zone 11b?
In Zone 11b, expect to harvest Cosmos from January 8 – September 3. Cosmos takes 60-90 days from planting to harvest.
What is the last frost date for Zone 11b?
The average last spring frost in Zone 11b 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 Cosmos?
Good companion plants for Cosmos include Marigolds, Zinnias, Basil, Tomatoes. These companions can help with pest control, pollination, and nutrient sharing.
Your Zone 11b Garden Planner — Free
A 22-page printable planner tailored to Zone 11b. Planting dates, monthly task lists, harvest log, seed inventory, and succession charts — everything you need to plan a full season.