🌤 Weather at Patos Island Marine State Park by season
| Spring | Summer | Fall | Winter |
|---|---|---|---|
| 41–62 °F | 51–69 °F | 42–65 °F | 38–46 °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 Olga 2 SE, 14 mi away, elevation 80 ft. Conditions at the park can differ from the station, especially where elevation differs — check a forecast before you go.
🏆 Northernmost San Juan — Remote 207-acre island near the Canadian border — the northernmost island in the San Juan archipelago with an active Alaskan-style lighthouse
Patos Island Marine State Park is a remote 207-acre island at the very northern edge of the San Juan Islands — less than a mile from the Canadian border! The island features an active lighthouse (Patos Island Light, built 1893/rebuilt 1908) that guides maritime traffic through Boundary Pass. The island’s old-growth Douglas fir forest, Garry oak meadows, and rocky shoreline harbor nesting bald eagles, river otters, and harbor seals. The surrounding waters are prime orca whale territory — the endangered Southern Resident orcas pass through Boundary Pass regularly.
Visitor Information
| Detail | Information |
|---|---|
| Location | San Juan Islands, WA (near Canada!) |
| Entry Fee | Discover Pass required |
| Size | 207 acres — northernmost! |
| Lighthouse | 1893 — still active! |
About Patos Island
Patos Island Marine State Park is the northernmost of Washington’s San Juan Islands — a remote 207-acre island just south of the Canadian border. The island features the historic Alden Point Lighthouse (1893) and some of the most spectacular rocky shoreline in the San Juan archipelago. Orca whales frequently pass through the surrounding waters.
Things to Do
Boat-in camping (primitive sites at Active Cove), kayaking, hiking to the historic Alden Point Lighthouse, tidepooling on the dramatic rocky shore, and whale watching. The island’s remote location means excellent solitude and dark-sky stargazing.
Insider Tips
Northernmost San Juan: Patos Island is the northernmost island in the San Juan archipelago — you can see Canada from the beach. Pro tip: The historic Alden Point Lighthouse (1893) is a remote treasure — one of the most isolated lighthouses in Puget Sound. Boat access only: No ferry — kayak or private boat required. The isolation is the reward.
Best Time to Visit
Summer: Calmest seas for the crossing. Fall: Fewer boaters, wildlife active. Spring: Whale migration through the channel. Winter: Not recommended — rough seas.
Frequently Asked Questions
Can I kayak to Patos Island?
Experienced kayakers can reach Patos from Sucia Island (3 miles) — but the strait crossing involves strong currents and exposure to weather. Only attempt in calm conditions with proper equipment and experience. The paddle rewards with a remote island experience — old-growth forest, rocky beaches, and a historic lighthouse with no other visitors.
Make it a road trip: Pair a visit with Sucia Island Marine State Park (a short drive away) or Matia Island Marine State Park (a short drive away).
Camping reservations: Book campsites and cabins for Washington state parks online at washington.goingtocamp.com.
🗼 Visit Patos Island Marine SP
Northernmost San Juan — 1893 lighthouse at the Canadian border!
Wildlife & Nature
Patos Island Marine State Park — a 207-acre island near the Canadian border, accessible only by boat — is one of the most remote and primitive marine parks in the San Juan Islands. The Alden Point Lighthouse (1893, now automated) marks the island’s western tip. Harbor seals haul out on rocky shores. Bald eagles nest in old-growth Douglas fir. Orca whales pass through Boundary Pass (the US-Canada border). Rhinoceros auklets and tufted puffins fish offshore. The island’s isolation provides exceptional stargazing.
Nearby Attractions
Sucia Island State Park — 2 miles south — is the most popular marine park in the San Juans. Matia Island Marine State Park — 3 miles southeast. Orcas Island — 10 miles south — has Moran State Park. Bellingham is the nearest mainland port.
🐾 Dogs & Pets at Patos Island Marine State Park
- Pets allowed? statewide rule
- Pets are allowed in most Washington state parks but must be under physical control on a leash at all times.
- Leash rule statewide rule
- 8 ft maximum leash required; pets must be under physical control
- Beaches & swim areas statewide rule
- Pets are not permitted on designated swim beaches
- Cabins & lodging statewide rule
- Pets are not allowed inside vacation houses but are permitted in designated pet-friendly cabins and yurts (e.g. Grayland Beach, Seaquest, Ike Kinswa — Cape Disappointment does NOT allow pets in its yurts), typically up to two pets, with a pet fee
- Pet fees statewide rule
- No day-use pet fee; $15 per night pet fee in pet-friendly cabins/yurts
- Statewide exceptions statewide rule
- Director-designated off-leash areas are exempt from the leash rule and are conspicuously posted
Are dogs allowed at Patos Island Marine State Park?
Pets are allowed in most Washington state parks but must be under physical control on a leash at all times. Individual parks can post stricter rules — check signage on arrival.
Rules verified July 2026 via parks.wa.gov. More: Washington state parks guide · Dog rules in all 50 states compared
Park Location
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