When to Plant in Alaska

Alaska's short but intense growing season is legendary, with up to 20 hours of daylight in mid-summer that can produce giant vegetables. Most of the state's agriculture happens in the Mat-Su Valley and the Tanana Valley near Fairbanks, where summers are warm enough for many common crops.

Success in Alaska requires careful attention to soil temperature and protection from sudden cold spells. The long days mean plants grow rapidly, but the window from the last spring frost in late May to the first fall frost in early September is narrow.

Common Mistakes

Planting before the soil warms up — Alaska's ground stays cold long after the snow melts.
Not using season extension tools like plastic mulch or hoop houses.
Overlooking the rapid growth rate caused by 20-hour days — plants need more nutrients and water than usual.
Choosing long-season varieties that won't mature before the September frost.

FAQ

What is the last frost date?

In much of Alaska, it's late May or early June. In the interior, it can be even later.

When should I start tomatoes indoors in Alaska?

Start them in late March or early April, as you'll need large transplants to make the most of the short season.

Can I plant before the last frost?

Yes, hardy crops like peas, potatoes, and kale can handle light frost and cold soil better than others.

Why does timing vary so much within Alaska?

Alaska spans multiple climate zones, from the maritime coast to the subarctic interior.

What if I live in a frost-free area?

There are no frost-free areas in Alaska, though some coastal areas have very mild winters.

How does Plan My Garden create my schedule?

We use your zip code to find your local frost dates and calculate the best times for each crop.

City planting guides in Alaska

Anchorage