In USDA zone 8, the last spring frost usually falls between Feb 25 and Mar 25. Start leeks indoors around Jan 1 to Jan 20. Plant them out around Mar 9 to Apr 3. Expect to harvest around Aug 6 to Oct 21.
| Start seeds indoors | Jan 1 to Jan 20 |
|---|---|
| Plant outside | Mar 9 to Apr 3 |
| Harvest | Aug 6 to Oct 21 |
| Typical last spring frost | Feb 25 to Mar 25 |
| Typical first fall frost | around Nov 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.