When to plant onions in Zone 11

In Zone 11, the last spring frost usually passes around January 1 and the first fall frost arrives around December 31, leaving about 365 frost-free days. The windows below are computed from those frost dates, with the same math the Dibble app uses.

Frost-free, tropical. Year-round growing; timing follows wet/dry and heat, not frost.

Planting windows for onions in Zone 11

The harvest estimate counts 100 days to maturity, then a picking window of about 14 days. These windows use typical frost dates for Zone 11; Dibble pins them to your exact ZIP code.

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Onion in a Zone 11 season

Zone 11 gives about 365 frost-free days. Onion needs roughly 100 days from transplant. That leaves about 265 days of slack, so there is room for a late start or a second planting.

How to grow onions

Start seeds indoors about 8 weeks before planting out, or use sets. Match the variety to your day length (short-day types near the equator, long-day types far from it) and plant out in the cool part of the year. Cure the bulbs in dry weather once the tops fall over.

Companion plants

Good neighbors for Onion:

Better kept apart:

Onion in other zones

Not in Zone 11? Pick your zone for the same dated windows.

Keep exploring

Onion: the full growing guide · The Zone 11 planting calendar · Every crop and zone

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Dates are estimates based on typical frost dates for the zone. Your yard has its own microclimate, so use them as a starting point and adjust as you learn your space.