When to plant Brussels sprouts in zone 4
In USDA zone 4, the last spring frost usually falls between May 1 and May 20. Start Brussels sprouts indoors around Apr 21 to May 22. Plant them out around Jun 21 to Jul 15. Zone 4's season is tight for Brussels sprouts: pick the fastest varieties, start early under cover, or grow them in a greenhouse.
Zone 4 dates for Brussels sprouts
| Start seeds indoors | Apr 21 to May 22 |
|---|---|
| Plant outside | Jun 21 to Jul 15 |
| Harvest | Tight: the season is short for Brussels sprouts here |
| Typical last spring frost | May 1 to May 20 |
| Typical first fall frost | around Sep 15 |
USDA zones measure winter cold, not frost dates, so these are typical dates for the zone. Towns in the same zone can be weeks apart.
Get dates for Brussels sprouts in your exact town, not just your zone.
Get my dates free →How to grow Brussels sprouts
A long-season treat, sweetened by frost. Read the full Brussels sprouts growing guide: spacing, sun and soil, step-by-step care, problems and the best varieties.