When to plant Cosmos
Thrives on neglect — too-rich soil gives leaves at the expense of flowers.
TypeFlowers
Frost toleranceTender (no frost)
Days to maturity~60
When to plant Cosmos by USDA zone
| Zone | When to plant |
|---|---|
| Zone 1a | Direct sow outdoors Jun 15–Jun 29 |
| Zone 1b | Direct sow outdoors Jun 10–Jun 24 |
| Zone 2a | Direct sow outdoors Jun 5–Jun 19 |
| Zone 2b | Direct sow outdoors May 30–Jun 13 |
| Zone 3a | Direct sow outdoors May 25–Jun 8 |
| Zone 3b | Direct sow outdoors May 20–Jun 3 |
| Zone 4a | Direct sow outdoors May 15–May 29 |
| Zone 4b | Direct sow outdoors May 10–May 24 |
| Zone 5a | Direct sow outdoors May 5–May 19 |
| Zone 5b | Direct sow outdoors Apr 30–May 14 |
| Zone 6a | Direct sow outdoors Apr 21–May 5 |
| Zone 6b | Direct sow outdoors Apr 15–Apr 29 |
| Zone 7a | Direct sow outdoors Apr 7–Apr 21 |
| Zone 7b | Direct sow outdoors Apr 1–Apr 15 |
| Zone 8a | Direct sow outdoors Mar 22–Apr 5 |
| Zone 8b | Direct sow outdoors Mar 15–Mar 29 |
| Zone 9a | Direct sow outdoors Feb 28–Mar 14 |
| Zone 9b | Direct sow outdoors Feb 15–Mar 1 |
| Zone 10a | Direct sow outdoors Jan 31–Feb 14 |
| Zone 10b | Direct sow outdoors Jan 15–Jan 29 |
| Zone 11a | Direct sow outdoors Jan 1–Jan 15 |
| Zone 11b | Direct sow outdoors Jan 1–Jan 15 |
| Zone 12a | Direct sow outdoors Jan 1–Jan 15 |
| Zone 12b | Direct sow outdoors Jan 1–Jan 15 |
| Zone 13a | Direct sow outdoors Jan 1–Jan 15 |
| Zone 13b | Direct sow outdoors Jan 1–Jan 15 |