When to plant Brussels Sprouts in Zone 1a
In Zone 1a, Brussels Sprouts: start seeds indoors around May 4–May 18; transplant outdoors around Jun 8–Jun 22. Expect to harvest around Sep 16–Sep 30.
| Step | When |
|---|---|
| Start seeds indoors | May 4 – May 18 |
| Transplant outdoors | Jun 8 – Jun 22 |
| Harvest | Sep 16 – Sep 30 |
Tip: A long-season crop best for fall — the sprouts sweeten after a frost or two.
Zone 1a averages a last spring frost around Jun 15 and a first fall frost around Aug 15. These are zone averages — look up your ZIP for your exact area.
See the full Zone 1a calendar in the tool →