When to Plant Cosmos in Zone 3b
Get the exact Zone 3b timeline for your Cosmos. See localized frost dates, indoor sowing windows, and optimal companions below.
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Explore Cosmos Data
Crop Dates : 3b
| Milestone | Date |
|---|---|
| Start Indoors | Apr 28th |
| Last Frost | May 19th |
| Transplant / Sow Outdoors | May 19th |
| Harvest Begins | Jul 18th |
| Harvest Ends | Sep 21st |
