When to plant Brussels Sprouts in Zone 3a
In Zone 3a, Brussels Sprouts: start seeds indoors around Apr 13–Apr 27; transplant outdoors around May 18–Jun 1. Expect to harvest around Aug 26–Sep 9.
| Step | When |
|---|---|
| Start seeds indoors | Apr 13 – Apr 27 |
| Transplant outdoors | May 18 – Jun 1 |
| Harvest | Aug 26 – Sep 9 |
Tip: A long-season crop best for fall — the sprouts sweeten after a frost or two.
Zone 3a averages a last spring frost around May 25 and a first fall frost around Sep 8. These are zone averages — look up your ZIP for your exact area.
See the full Zone 3a calendar in the tool →