When to plant blackberries in zone 4
In USDA zone 4, the last spring frost usually falls between May 1 and May 20. Plant around Apr 21 to Jun 3. Once established, expect to harvest around Aug 6 to Oct 21.
Zone 4 dates for blackberries
| Sow or plant outside | Apr 21 to Jun 3 |
|---|---|
| Harvest | Aug 6 to Oct 21 |
| 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 blackberries in your exact town, not just your zone.
Get my dates free →How to grow blackberries
Big yields — pick thornless, hardy types. Read the full blackberries growing guide: spacing, sun and soil, step-by-step care, problems and the best varieties.