When to plant onions in zone 6
In USDA zone 6, the last spring frost usually falls between Apr 5 and Apr 30. Start onions indoors around Jan 27 to Feb 27. Plant them out around Apr 10 to May 5. Expect to harvest around Aug 10 to Sep 16.
Zone 6 dates for onions
| Start seeds indoors | Jan 27 to Feb 27 |
|---|---|
| Plant outside | Apr 10 to May 5 |
| Harvest | Aug 10 to Sep 16 |
| Typical last spring frost | Apr 5 to Apr 30 |
| Typical first fall frost | around Oct 15 |
USDA zones measure winter cold, not frost dates, so these are typical dates for the zone. Towns in the same zone can be weeks apart.
Get dates for onions in your exact town, not just your zone.
Get my dates free →How to grow onions
Plant once, season everything all year. Read the full onions growing guide: spacing, sun and soil, step-by-step care, problems and the best varieties.