In USDA zone 4, the last spring frost usually falls between May 1 and May 20. Sow or plant lettuce & greens around Apr 9 to May 28. Expect to harvest around Jun 9 to Jul 28.
| Sow or plant outside | Apr 9 to May 28 |
|---|---|
| Harvest | Jun 9 to Jul 28 |
| 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 lettuce & greens in your exact town, not just your zone.
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