Alaska · zones 3a–8a
When to plant broccoli in Alaska.
Sow or transplant between Mar 21 to Apr 18 in a typical year, keyed to Alaska's median last frost around May 12. A second, fall sowing fits Jun 1 to Jul 11. Dates below are state medians; your ZIP code shifts them by days to weeks.
The 2026 windows
Broccoli dates for a typical Alaska season.
1 · Start indoors
Feb 7 to Mar 7
About 6 weeks before set-out. Warm spot, real light.
2 · Set out
Mar 21 to Apr 18
Keyed to the ~May 12 last frost. Sow 0.5" deep, 18" apart.
Fall round
Jun 1 to Jul 11
Counted back from the ~Sep 15 first frost.
Harvest
~60 days later
~1.2 lb per plant over ~3 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.