How to Grow Onions
veg · hardy · ~100 days to harvest
Planting time for onions depends on your frost dates. Start seeds indoors about 10 weeks before your last spring frost, then transplant after frost danger passes. Pick your zone below for exact dates.
When to plant onions by zone
Zone 3a
Zone 3b
Zone 4a
Zone 4b
Zone 5a
Zone 5b
Zone 6a
Zone 6b
Zone 7a
Zone 7b
Zone 8a
Zone 8b
Zone 9a
Zone 9b
Zone 10a
Zone 10b
Zone 11a
Zone 11b
Zone 12a
Zone 12b
Zone 13a
Zone 13b
Frequently asked questions
How long does onions take to grow?
About 100 days from transplant/sow to harvest.
Is onions frost-hardy?
Onions is a hardy crop. It tolerates light frost and can go out early.