Growing Cosmos in Zone 13
When to plant and harvest cosmos in Zone 13— based on your zone's frost dates.
Zone 13 runs warmer than cosmos' usual range (Zones 2–11). Heat can cut the season short, so focus on the cooler shoulder months.
Cosmos planting calendar for Zone 13
These months are derived from Zone 13's frost dates — last frost around None, first frost around None.
Start indoors
—
Sow outdoors
January
Transplant
—
Harvest
—
Cosmos care at a glance
- Sunlight
- Full sun (6+ hours)
- Water
- Low — drought-tolerant once established
- Spacing
- 12–18 in apart
- Days to maturity
- 50–90 days to first bloom
- Best zones
- 2–11 (warm-season annual)
Growing cosmos in Zone 13: FAQs
Can you grow cosmos in Zone 13?＋
Zone 13 runs warmer than cosmos' usual range (Zones 2–11). Heat can cut the season short, so focus on the cooler shoulder months.
When should I plant cosmos in Zone 13?＋
In Zone 13, sow outdoors around January. Zone 13's last spring frost is typically None and its first fall frost around None, which sets the planting window.
When to harvest cosmos in Zone 13?＋
Harvest timing depends on your planting date and variety — cosmos typically matures in 50–90 days to first bloom. See the full guide for harvest cues.
Full Cosmos guide →
Complete care, problems, companions, and harvest tips.
Zone 13 overview →
Frost dates, climate, and everything to grow here.
June in Zone 13 →
What to sow, transplant, and harvest this month.