Alaska · zones 3a–8a
When to plant kale in Alaska.
Sow or transplant between Apr 4 to May 2 in a typical year, keyed to Alaska's median last frost around May 12. A second, fall sowing fits Jun 15 to Jul 31. Dates below are state medians; your ZIP code shifts them by days to weeks.
The 2026 windows
Kale dates for a typical Alaska season.
1 · Start indoors
Feb 21 to Mar 21
About 6 weeks before set-out. Warm spot, real light.
2 · Set out
Apr 4 to May 2
Keyed to the ~May 12 last frost. Sow 0.25" deep, 16" apart.
Fall round
Jun 15 to Jul 31
Counted back from the ~Sep 15 first frost.
Harvest
~45 days later
~2 lb per plant over ~16 weeks.
Alaska spans more than one climate: Zone 3 is the most common zone, but the state runs 3a to 8a. That's why the planner works from your ZIP code's frost dates, not your zone — mountain and coastal gardens in the same state can be three weeks apart.