Perennial

When to Plant Hostas in Alaska

The king of shade gardens. Hostas come in hundreds of varieties and get more beautiful with each passing year.

The Short Answer

In Alaska, plant hostas based on your regional frost dates. Interior Alaska has a last frost around May 15 - Jun 1, while Southeast Alaska sees frost end around Apr 15 - May 5. Extreme daylight variation. Summer days of 18-24 hours of sunlight accelerate growth. Very short growing season in...

Alaska Frost Dates

Your planting dates depend on which part of Alaska you're in. Here are the frost date ranges by region:

Region Zones Last Frost (Spring) First Frost (Fall)
Interior Alaska 1a, 2a, 2b May 15 - Jun 1 Aug 20 - Sep 10
Southcentral Alaska 3b, 4a, 4b May 1 - May 20 Sep 10 - Sep 25
Southeast Alaska 5a, 5b, 6a Apr 15 - May 5 Sep 25 - Oct 15

Hostas Planting Schedule for Alaska

Interior Alaska (Zones 1a, 2a, 2b)

Average last frost: May 15 - Jun 1 · Average first frost: Aug 20 - Sep 10

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0 wks after frost

Southcentral Alaska (Zones 3b, 4a, 4b)

Average last frost: May 1 - May 20 · Average first frost: Sep 10 - Sep 25

Transplant Outside
0 wks after frost

Southeast Alaska (Zones 5a, 5b, 6a)

Average last frost: Apr 15 - May 5 · Average first frost: Sep 25 - Oct 15

Transplant Outside
0 wks after frost

Growing Hostas in Alaska

Hostas in Alaska's Climate

Your climate is hosta heaven. Cold winters provide necessary dormancy, moderate summers prevent heat scorch, and abundant shade from deciduous forests creates ideal growing conditions. Michigan, Minnesota, and Wisconsin grow some of the finest hostas in the country. The only pest concern is slugs — iron phosphate bait handles them.

Soil Considerations for Alaska

Varies widely. Interior has permafrost challenges. Raised beds essential for warming soil. Highly acidic soils common.

Alaska Climate & Growing Season

Extreme daylight variation. Summer days of 18-24 hours of sunlight accelerate growth. Very short growing season in interior. Hostas can handle frost well, which is an advantage in Alaska's climate. You can push planting dates earlier in spring and extend into fall.

Growing season length varies across Alaska: Interior Alaska (1a, 2a, 2b) has a last frost around May 15 - Jun 1, while Southeast Alaska (5a, 5b, 6a) sees frost end around Apr 15 - May 5. This difference matters for hostas — adjust your planting dates to match your specific region.

Growing Tips

Plant divisions or nursery plants in spring or fall. Slugs are the main enemy — use iron phosphate bait. Mulch to retain moisture.

Companion Planting

Plant hostas alongside these companions for better growth:

Ferns Astilbe Heuchera

The Bottom Line

Hostas can be grown successfully across Alaska, but your exact planting dates depend on which region you're in. Interior Alaska gardeners should plan around a May 15 - Jun 1 last frost, while those in Southeast Alaska can typically plant earlier. For exact dates based on your zip code, use our free planting date finder.

Related Guides

Hostas Growing Guide National planting guide with all states Alaska Planting Calendar All plants for Alaska Hostas in Alabama Alabama planting dates Hostas in Arizona Arizona planting dates Hostas in Arkansas Arkansas planting dates
Note: All dates are based on NOAA 30-year Climate Normals and represent historical averages, not predictions for any specific year. Always check your local weather forecast before planting frost-sensitive crops. Learn about our data sources.

Last reviewed: March 29, 2026

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