In USDA zone 7, the last spring frost usually falls between Apr 1 and Apr 20. Start leeks indoors around Jan 20 to Feb 20. Plant them out around Apr 9 to May 4. Expect to harvest around Sep 6 to Nov 21.
| Start seeds indoors | Jan 20 to Feb 20 |
|---|---|
| Plant outside | Apr 9 to May 4 |
| Harvest | Sep 6 to Nov 21 |
| Typical last spring frost | Apr 1 to Apr 20 |
| Typical first fall frost | around Oct 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 →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.