When to plant Brussels Sprouts in Zone 5a
In Zone 5a, Brussels Sprouts: start seeds indoors around Mar 24–Apr 7; transplant outdoors around Apr 28–May 12. Expect to harvest around Aug 6–Aug 20.
| Step | When |
|---|---|
| Start seeds indoors | Mar 24 – Apr 7 |
| Transplant outdoors | Apr 28 – May 12 |
| Harvest | Aug 6 – Aug 20 |
Tip: A long-season crop best for fall — the sprouts sweeten after a frost or two.
Zone 5a averages a last spring frost around May 5 and a first fall frost around Oct 1. These are zone averages — look up your ZIP for your exact area.
See the full Zone 5a calendar in the tool →