When to plant Brussels Sprouts in Zone 3b
In Zone 3b, Brussels Sprouts: start seeds indoors around Apr 8–Apr 22; transplant outdoors around May 13–May 27. Expect to harvest around Aug 21–Sep 4.
| Step | When |
|---|---|
| Start seeds indoors | Apr 8 – Apr 22 |
| Transplant outdoors | May 13 – May 27 |
| Harvest | Aug 21 – Sep 4 |
Tip: A long-season crop best for fall — the sprouts sweeten after a frost or two.
Zone 3b averages a last spring frost around May 20 and a first fall frost around Sep 12. These are zone averages — look up your ZIP for your exact area.
See the full Zone 3b calendar in the tool →