GrowZone

Seed-start answer

Start kale seeds indoors around Apr 5

This uses ZIP 53202, the Milwaukee frost station, and the May 10 last-frost estimate.

Seed starting schedule

Kale dates for Milwaukee, WI

StepDateHow to use it
Start IndoorsApril 5, 2026Start seeds under lights or in a bright indoor seed-starting space.
Transplant OutdoorsApril 26, 2026Move hardened-off seedlings outside after the frost-risk window.
Direct SowApril 19, 2026Sow seed outside when the crop and soil can handle the window.