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When to Plant Onions in Zone 6

In USDA zone 6a, start seeds indoors around February 14, transplant or plant outdoors March 28 to July 16, and expect your first harvest around July 16. (6a shown here — see 6a and 6b dates separately below.)

Onions planting calendar for USDA Zone 6a

Average last spring frost

April 25

Average first fall frost

October 10

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Start seeds indoors

Feb 14

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Transplant outdoors

Mar 28

🌾

Projected first harvest

Jul 16

J
F
M
A
M
J
J
A
S
O
N
D
🌱 Start indoors🌿 Growing outside🌾 HarvestTodayZone 6a (approximate)

Most onions mature in about 90 to 110 days depending on the variety, needing roughly 168 frost-free days in zone 6a.

Onions planting calendar for USDA Zone 6b

Average last spring frost

April 20

Average first fall frost

October 15

🌱

Start seeds indoors

Feb 9

🌿

Transplant outdoors

Mar 23

🌾

Projected first harvest

Jul 11

J
F
M
A
M
J
J
A
S
O
N
D
🌱 Start indoors🌿 Growing outside🌾 HarvestTodayZone 6b (approximate)

Most onions mature in about 90 to 110 days depending on the variety, needing roughly 178 frost-free days in zone 6b.

Not sure whether you're in 6a or 6b? Set your ZIP in HomeSown for dates tuned to your exact location.

Varieties to grow

8 varieties of onions in the HomeSown library. Tap any for its full grow guide.

Cipollini Onion →Pearl Onion →Red Onion →Spanish Onion →Vidalia Sweet Onion →Walla Walla Sweet Onion →White Onion →Yellow Sweet Onion →

Common problems with onions

What to watch for, with identification and treatment for each

Onion MaggotLeek MothSeed Corn MaggotSeedcorn MaggotBulb MiteWirewormsPink RootBotrytis Neck RotFusarium Basal RotWhite RotCracking & SplittingBulb Rot

🌱 Grow onions with a calendar built for your exact yard

HomeSown turns your ZIP code into a personalized planting calendar, watering reminders, and pest help. Free to start.

Start your free garden →

When to plant onions in other zones

All zonesZone 3 →Zone 4 →Zone 5 →Zone 7 →Zone 8 →Zone 9 →Zone 10 →