Growing Cosmos in Zone 1
When to plant and harvest cosmos in Zone 1— based on your zone's frost dates.
Zone 1 sits just outside cosmos' ideal range (Zones 2–11), but a good harvest is achievable with careful timing and a little season extension.
Cosmos planting calendar for Zone 1
These months are derived from Zone 1's frost dates — last frost around Late May – mid June, first frost around Late July – mid August.
Start indoors
—
Sow outdoors
June
Transplant
—
Harvest
September
Free planting calendar
Put cosmos on your own planting calendar
A month-by-month Zone 1 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 1: FAQs
Can you grow cosmos in Zone 1?＋
Zone 1 sits just outside cosmos' ideal range (Zones 2–11), but a good harvest is achievable with careful timing and a little season extension.
When should I plant cosmos in Zone 1?＋
In Zone 1, sow outdoors around June. Zone 1's last spring frost is typically Late May – mid June and its first fall frost around Late July – mid August, which sets the planting window.
When to harvest cosmos in Zone 1?＋
Expect to harvest cosmos in Zone 1 around September, depending on the season and variety.
Full Cosmos guide →
Complete care, problems, companions, and harvest tips.
Zone 1 overview →
Frost dates, climate, and everything to grow here.
October in Zone 1 →
What to sow, transplant, and harvest this month.