When to plant onions in Alaska

Onions
Plant out in Anchorage
Apr 4–Apr 25

Across Alaska the window opens between March 22 and April 4. Find your city below; the dates follow each town's own average last frost.

Start indoors, Anchorage
Feb 21–Mar 21
Plant out, Anchorage
Apr 4–Apr 25
Last frost, Anchorage
May 16

Start seeds indoors 8–12 weeks before the last frost; plant out 3–6 weeks before the last frost. Northern gardens need long-day varieties and southern gardens need short-day ones. A wrong pick gives small bulbs.

Onions planting dates by city

Start indoorsPlant outSow outdoorsFall plantingAverage last and first frost
JanFebMarAprMayJunJulAugSepOctNovDec
AnchorageApr 4–Apr 25
JuneauMar 22–Apr 12
FairbanksApr 4–Apr 25

Questions

When should I plant onions in Alaska?

In Anchorage, plant out from April 4 to April 25. Across Alaska the window opens between March 22 and April 4, depending on the local last frost.

How is this date worked out?

Start seeds indoors 8–12 weeks before the last frost; plant out 3–6 weeks before the last frost. Frost dates are NOAA 1991–2020 averages for the weather station nearest each city.

More for Alaska

Onions in other states

Frost dates for every city in Alaska