Growing Onions in Zone 1
When to plant and harvest onions in Zone 1— based on your zone's frost dates.
Zone 1 is colder than onions' usual range (Zones 3–9). Expect to lean on indoor starts, containers, or row covers — or treat it as a short-season experiment.
Onions 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
April
Sow outdoors
—
Transplant
May
Harvest
October
Onions care at a glance
- Sunlight
- Full sun
- Water
- 1 inch per week; stop as tops fall
- Spacing
- 4 in apart
- Days to maturity
- 90–120 days
- Best zones
- 3–9 (choose day-length type for your latitude)
Growing onions in Zone 1: FAQs
Can you grow onions in Zone 1?＋
Zone 1 is colder than onions' usual range (Zones 3–9). Expect to lean on indoor starts, containers, or row covers — or treat it as a short-season experiment.
When should I plant onions in Zone 1?＋
In Zone 1, start seeds indoors around April. 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 onions in Zone 1?＋
Expect to harvest onions in Zone 1 around October, depending on the season and variety.
Full Onions guide →
Complete care, problems, companions, and harvest tips.
Zone 1 overview →
Frost dates, climate, and everything to grow here.
June in Zone 1 →
What to sow, transplant, and harvest this month.