When to plant Onion in Zone 8b
In Zone 8b, Onion: start seeds indoors around Jan 4–Jan 18; transplant outdoors around Feb 15–Mar 1. Expect to harvest around May 26–Jun 9.
| Step | When |
|---|---|
| Start seeds indoors | Jan 4 – Jan 18 |
| Transplant outdoors | Feb 15 – Mar 1 |
| Harvest | May 26 – Jun 9 |
Tip: Day-length sensitive — match the variety (long/short day) to your latitude for big bulbs.
Zone 8b averages a last spring frost around Mar 15 and a first fall frost around Nov 25. These are zone averages — look up your ZIP for your exact area.
See the full Zone 8b calendar in the tool →