When to plant broccoli in zone 4
In USDA zone 4, the last spring frost usually falls between May 1 and May 20. Start broccoli indoors around Mar 10 to Apr 15. Plant them out around May 3 to Jun 3. Expect to harvest around Jun 21 to Aug 6.
Zone 4 dates for broccoli
| Start seeds indoors | Mar 10 to Apr 15 |
|---|---|
| Plant outside | May 3 to Jun 3 |
| Harvest | Jun 21 to Aug 6 |
| 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 broccoli in your exact town, not just your zone.
Get my dates free →How to grow broccoli
A cool-season classic with a big main head. Read the full broccoli growing guide: spacing, sun and soil, step-by-step care, problems and the best varieties.