Tree Care in Unalaska, AK

In Unalaska, where we have zone 8a conditions that are very cold, your trees are around 36 years old. You have several big oaks - Bur Oaks, maples like Sugar Maples and Silver Maples, birches such as Paper Birches, and pines including Eastern White Pines. There’s also some concern for invasive Green/White Ash and Silver Maples. The growing season is short at about seven months, with heavy rains averaging 60.1 inches annually. January lows drop to 28.7°F while July highs reach 57.4°F. We don’t get many storms or drought conditions.

Why Tree Care Matters in Unalaska

Proper tree care is crucial because these older trees could face serious health issues due to age and local pests and diseases. Regular pruning and proper watering can help keep them healthy and strong.

Your Tree's History

Trees planted during the 1980s through early 2000s era have matured into this climate's demands. Now, they struggle with diseases like Laminated Root Rot and Bronze Birch Borer, which were less prevalent when planted.

Zone 8a USDA Hardiness

7 Very Cold

~36 years Avg Tree Age

7 months Growing Season

Unalaska Climate Profile

Risk Assessment

Growing & Pruning

Tree Services in Unalaska

Tree Removal

Safe removal of dead, dying, hazardous, or unwanted trees

Tree Trimming & Pruning

Professional pruning for health, safety, and appearance

Stump Grinding & Removal

Complete stump removal after tree cutting

Emergency Tree Service

24/7 response for storm damage, fallen trees, and hazardous situations

Tree Health & Disease Treatment

Diagnosis and treatment of tree pests, diseases, and nutrient deficiencies

Common Trees in Unalaska

Bur Oak

Toughest native oak - drought, cold, and wind tolerant. Massive specimens

Sugar Maple

Fall color champion, syrup production, but salt-sensitive along roads

White Birch - common in Aleutians East Borough, AK

White Birch (Paper Birch)

Iconic white bark, short-lived (40-50 years), bronze birch borer vulnerable

Eastern White Pine

Tall, fast-growing, soft needles - blister rust susceptible

Basswood - common in Aleutians East Borough, AK

Basswood (American Linden)

Excellent shade, fragrant flowers, attracts pollinators

Active Tree Threats in Aleutians East Borough

Laminated Root Rot high

Affects: Douglas fir (primary), grand fir, mountain hemlock - the dominant conifers of the PNW

Soil fungus (Phellinus sulphurascens) that spreads through root contact. Infected trees show reduced growth, thinning crown, and eventually blow over in wind because roots are rotted. Spreads slowly but persistently through stands.

What to do: If a Douglas fir falls or shows lean/crown thinning, have roots assessed. Adjacent trees connected by root contact may also be infected. Stumps of infected trees continue to spread the fungus - consider stump grinding.

Swiss Needle Cast moderate-high

Swiss Needle Cast - active in Aleutians East Borough, AK

Affects: Douglas fir - the most common tree in PNW landscapes

Fungal disease that causes Douglas fir to shed needles prematurely. Trees look thin and yellow. Fog and moisture promote the fungus. Coastal areas worst affected.

What to do: Improve air circulation through pruning. In severe cases, consider fungicide treatment. May need to diversify away from Douglas fir in heavily affected areas.

Bronze Birch Borer moderate

Bronze Birch Borer - active in Aleutians East Borough, AK

Affects: European white birch (highly susceptible), paper birch, other birch species

Native beetle that attacks stressed birch trees. Larvae bore under bark, killing branches from top down. European white birch (the popular ornamental) is far more susceptible than native species.

What to do: Keep birch well-watered - drought stress is the #1 trigger. Mulch root zone. Consider replacing European white birch with resistant River Birch or native paper birch.

Unalaska Tree Data

Hardiness Zone

28.7°F

Jan Avg Low

57.4°F

Jul Avg High

60.1"

Annual Rainfall

81.6"

Annual Snowfall

Storm Events/Year

N/A

Tree & Landscape Companies in Aleutians East Borough

$434,200

Median Home Value

Hiring a Tree Service in Unalaska

Finding reliable tree service is tough since there aren’t any landscaping companies in the Aleutians East Borough area. It’s important to be cautious when choosing a provider.

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