Onion · Ho Chi Minh City, Ho Chi Minh City (HCMC), Vietnam
When to plant onions in Ho Chi Minh City
Main outdoor window
not outdoors here
The window this page is built around.
Timed from last spring frost
no spring frost
In Ho Chi Minh City, on your chosen risk.
First autumn frost
no autumn frost
The far end of the outdoor season.
The average last frost. Half of all years are later than this.
Step by step in Ho Chi Minh City
Each window is a range, not a single day. Earlier in the range buys you a longer season; later in it buys you a safer one.
Onions through the year
Against the frost risk in Ho Chi Minh City
Why these dates
Start seed ten weeks before last frost. Choose long-day cultivars above roughly 38 degrees latitude and short-day types below it - the wrong choice produces no bulb regardless of timing.
Young plants take -8C. Autumn-planted sets overwinter reliably in zone 6 and warmer.
Seed packets and extension guides express timing as weeks either side of the last spring frost, because that is the only reference point that travels. Onions are timed from 10 weeks before that frost for an indoor start, with planting out 4 weeks before it, and this page simply resolves those offsets against the frost date computed for Ho Chi Minh City.
Also in Ho Chi Minh City
Other vegetables to time
Growing onions in Ho Chi Minh City
How much frost will onions tolerate?
Young plants take -8C. Autumn-planted sets overwinter reliably in zone 6 and warmer.