Kosciusko Island
Island Forested Alaskan island in Alexander Archipelago
A forested island in southeast Alaska’s Alexander Archipelago, Kosciusko Island appeals to kayakers, anglers and wildlife watchers for spruce forests, sheltered bays and boat-access lodges.
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Kosciusko Island is a forested island in Alaska’s Alexander Archipelago, in the southeastern part of the state. It lies within the temperate rainforest zone and is remote and sparsely developed.
The island’s coastline is indented with bays and inlets and the interior is dominated by coastal forest and wetland terrain typical of the region. Human presence is limited and land use historically includes small-scale settlement, subsistence uses and, in parts of the archipelago, timber activities.
Administration falls under U.S. federal and Alaskan authorities; the island is within the maritime landscape of the Alexander Archipelago and is accessed by boat or aircraft from larger nearby communities.
- Conservation status: Part of the Alexander Archipelago and administered within the Tongass National Forest, so land-use and access are subject to federal and state rules.
- Access: Most access is by private boat or floatplane; there are no major road connections to the island.
How to Get to Kosciusko Island #
Access is by private boat or floatplane from regional hubs in Southeast Alaska. Charter services operate seasonally; coordinate with local operators and check weather forecasts carefully.
Tips for Visiting Kosciusko Island #
- Bring a shortwave radio or satellite communication device-cell coverage is limited on many Alaskan islands.
- If exploring, register intentions with local authorities; wildlife and weather create real hazards.
- Respect local indigenous land use and check for seasonal closures (e.g., bird nesting or subsistence activities).
Best Time to Visit Kosciusko Island #
Summer is most practical for access and outdoor activities; plan carefully in shoulder seasons.
Weather & Climate near Kosciusko Island #
Kosciusko Island's climate is classified as Oceanic - Oceanic climate with cool summers (peaking in August) and freezing winters (coldest in January). Temperatures range from -3°C to 16°C. Heavy rainfall (3973 mm/year), wettest in October.
January
January is the coldest month with highs of 2°C and lows of -3°C. Heavy rain (396 mm).
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February
February is cold with highs of 3°C and lows of -2°C. Heavy rain (322 mm).
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March
March is cold with highs of 4°C and lows of -1°C. Heavy rain (298 mm).
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April
April is cold with highs of 8°C and lows of 2°C. Heavy rain (260 mm).
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May
May is cold with highs of 11°C and lows of 5°C. Heavy rain (222 mm).
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June
June is cool with highs of 14°C and lows of 8°C. Significant rainfall (178 mm).
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July
July is cool with highs of 16°C and lows of 10°C. Significant rainfall (170 mm).
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August
August is cool with highs of 16°C and lows of 10°C. Heavy rain (244 mm).
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September
September is cool with highs of 13°C and lows of 8°C. Heavy rain (402 mm).
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October
October is cold with highs of 9°C and lows of 4°C. The wettest month with heavy rain (602 mm).
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November
November is cold with highs of 4°C and lows of 0°C. Heavy rain (452 mm).
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December
December is cold with highs of 2°C and lows of -2°C. Heavy rain (427 mm).
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