When to plant leeks in zone 4
In USDA zone 4, the last spring frost usually falls between May 1 and May 20. Start leeks indoors around Feb 19 to Mar 22. Plant them out around May 9 to Jun 3. Expect to harvest around Oct 6 to Oct 31.
Zone 4 dates for leeks
| Start seeds indoors | Feb 19 to Mar 22 |
|---|---|
| Plant outside | May 9 to Jun 3 |
| Harvest | Oct 6 to Oct 31 |
| 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 leeks in your exact town, not just your zone.
Get my dates free →How to grow leeks
Mild, hardy alliums that stand through winter. Read the full leeks growing guide: spacing, sun and soil, step-by-step care, problems and the best varieties.