Growing Cosmos in Zone 6
When to plant and harvest cosmos in Zone 6— based on your zone's frost dates.
Zone 6 sits comfortably within cosmos' best range (Zones 2–11), so it grows well here on a standard schedule.
Cosmos planting calendar for Zone 6
These months are derived from Zone 6's frost dates — last frost around Mid April – early May, first frost around Mid October – early November.
Start indoors
—
Sow outdoors
April
Transplant
—
Harvest
July
Free planting calendar
Put cosmos on your own planting calendar
A month-by-month Zone 6 chart with cosmos already on it — add the rest of your garden, then print it or save it as a PDF.
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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 6: FAQs
Can you grow cosmos in Zone 6?＋
Zone 6 sits comfortably within cosmos' best range (Zones 2–11), so it grows well here on a standard schedule.
When should I plant cosmos in Zone 6?＋
In Zone 6, sow outdoors around April. Zone 6's last spring frost is typically Mid April – early May and its first fall frost around Mid October – early November, which sets the planting window.
When to harvest cosmos in Zone 6?＋
Expect to harvest cosmos in Zone 6 around July, depending on the season and variety.
Full Cosmos guide →
Complete care, problems, companions, and harvest tips.
Zone 6 overview →
Frost dates, climate, and everything to grow here.
October in Zone 6 →
What to sow, transplant, and harvest this month.