Photo: Rose_Braverman, CC BY 3.0, via Wikimedia Commons
🌤 Weather at Skull Island by season
| Spring | Summer | Fall | Winter |
|---|---|---|---|
| 38–64 °F | 48–73 °F | 40–68 °F | 36–48 °F |
Each range runs from the coldest monthly average low to the warmest monthly average high in that season (1991-2020 climate normals), measured at Friday Harbor Airport, 8 mi away, elevation 109 ft. Conditions at the park can differ from the station, especially where elevation differs — check a forecast before you go.
🏆 San Juan Rock — Tiny rocky islet in the San Juan Islands — dramatic rock formation rising from the Salish Sea
Skull Island is a tiny rocky islet in the San Juan Islands — named for its skull-like shape when viewed from certain angles. This dramatic rock formation rises from the Salish Sea (the collective name for the waterways of Puget Sound, the Strait of Juan de Fuca, and the Strait of Georgia). The Salish Sea was named in 2009 to honor the Coast Salish peoples who have lived around these waterways for over 10,000 years. The rocky islets of the San Juans provide critical haul-out habitat for harbor seals and nesting sites for seabirds including pigeon guillemots and cormorants.
Visitor Information
| Detail | Information |
|---|---|
| Location | San Juan Islands, WA |
| Entry Fee | Discover Pass required |
| Name | Skull-shaped rock! |
| Sea | Salish Sea — named 2009 for Coast Salish! |
About Skull Island
Skull Island is a small rocky islet in the San Juan Islands archipelago — part of the San Juan Islands National Wildlife Refuge. Despite its ominous name (derived from its shape when viewed from certain angles), the island is a haven for nesting seabirds and hauled-out harbor seals. Landing is generally prohibited to protect wildlife.
Things to Do
Kayaking around the island (no landing permitted), wildlife viewing from the water — look for harbor seals, bald eagles, and nesting seabirds. The surrounding San Juan Channel waters are excellent for whale watching and kayaking.
Insider Tips
San Juan mystery: Skull Island’s ominous name comes from its shape — the rocky islet resembles a skull from certain angles. Pro tip: The island is a wildlife refuge — no landing allowed, but kayakers can circle the island to see nesting seabirds and hauled-out harbor seals. Marine reserves: Washington’s marine state parks protect fragile island ecosystems — leave-no-trace principles are essential.
Best Time to Visit
Summer: Best kayaking conditions for viewing. Spring: Nesting seabird activity. Fall: Seal haul-outs. Winter: Not recommended — rough waters.
Frequently Asked Questions
Why can’t I land on some islands?
Many small islands in the San Juan archipelago are protected as National Wildlife Refuges — landing is prohibited to protect nesting seabirds (pigeon guillemots, cormorants, oystercatchers) and marine mammals (harbor seals, sea lions). Disturbance during nesting can cause adults to abandon eggs. Kayakers should maintain 200+ yards from seal haul-outs and avoid nesting cliffs.
Make it a road trip: Pair a visit with Turn Island Marine State Park (a short drive away) or Jones Island State Park (a short drive away).
Nearby Attractions
The San Juan Islands ferry system connects the major islands. Orcas Island has Moran State Park. San Juan Island has Friday Harbor and Lime Kiln Point. Lopez Island is the “friendly island” for cycling.
Park Map
Plan your gear for Skull Island
From our editorial guides, matched to this park’s activities:
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