When to plant onions in zone 5
In USDA zone 5, the last spring frost usually falls between Apr 10 and May 10. Start onions indoors around Feb 3 to Mar 6. Plant them out around Apr 17 to May 12. Expect to harvest around Aug 17 to Sep 23.
Zone 5 dates for onions
| Start seeds indoors | Feb 3 to Mar 6 |
|---|---|
| Plant outside | Apr 17 to May 12 |
| Harvest | Aug 17 to Sep 23 |
| Typical last spring frost | Apr 10 to May 10 |
| 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.