Zone 11 · Cosmos

Planting Cosmos in Zone 11

Cosmos bipinnatus

✅ Cosmos thrives in zone 11 (hardy 2–11)

Can I plant today?

Cosmos has a specific planting window in zone 11. Check back in spring.

Evaluated for April 27, 2026 ·

Zone's last frost

essentially frost-free

Zone's first frost

essentially frost-free

Bloom window

June – October

Peak bloom

August

Sun required

full sun

Mature height

36"

Spacing

12" apart

Type

annual

How to plant Cosmos in zone 11

Start indoors 4 weeks before last frost or direct-sow after.

Cosmos peaks in August. These companions keep your bed in color before and after.

Snapdragon

Peaks in June

Petunia

Peaks in July

Impatiens

Peaks in July

Sweet Alyssum

Peaks in July

Want a full bed designed for zone 11?