When to Plant Cosmos in District of Columbia
State
District of Columbia
Cities Covered
2
USDA Zones
7a, 7b, 8a
Plant Type
Direct Sow
📅 Planting Calendar for District of Columbia
Based on Washington (Zone 8a). Dates may vary by city.
Direct Sow Outdoors Friday, March 20, 2026
Note: District of Columbia spans multiple zones (7a, 7b, 8a). Select your city below for more precise dates.
🌿 Plant Details
Scientific Name Cosmos bipinnatus
Days to Maturity 60 days
Sun Requirements Full Sun (6-8 hours)
Plant Spacing 18" apart
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Growing Cosmos in District of Columbia
Cosmos (Cosmos bipinnatus) is a popular garden vegetable in District of Columbia. The state spans USDA Hardiness Zones 7a, 7b, 8a, so planting dates can vary significantly depending on your location.
In most areas of District of Columbia, you can direct sow Cosmos outdoors around Friday, March 20, 2026.
For the most accurate planting dates, enter your ZIP code on our homepage or select your city from the list above.