The San Juan Islands rise from the waters of the Salish Sea, north of the Strait of Juan de Fuca. This northern archipelago comprises 172 named islands and reefs, stretching far beyond the four islands accessible by vehicular traffic. Though the San Juan Islands were heavily logged in the nineteenth century, there’s been extensive regrowth, and the area is now home to an abundance of wildlife, both on land and at sea. If you’re planning a guided kayak trip in the San Juans, or you’re just hopping on the next ferry to visit Friday Harbor, here’s what you might see while you explore the San Juan Islands.
The Salish Sea: A Wildlife Hotspot
The nutrient-rich waters of the Salish Sea, combined with the unique underwater topography, coastal geology, and regional climate, make it one of the most biodiverse regions in North America. The Salish is constantly replenished by nutrient-rich water flowing in from the Pacific, which mixes with freshwater from the area’s many rivers and streams, creating an ideal environment for life to flourish. Few marine areas possess the amount of diversity of habitat that you’ll find in the Salish. In the waters around the San Juan Islands, paddlers will discover Kelp forests, eelgrass meadows, rocky shorelines, sandy beaches, estuaries, deep channels, sheltered bays, small islands, and reefs.
Marine Mammals of the San Juan Islands
One of the main appeals for visitors exploring the San Juan Islands is the chance to encounter the various marine mammals that call these waters home. Around the islands, we regularly spot harbor seals, California and Stellar sea lions, and the occasional river otter. If we’re lucky, we may spot harbor porpoises, our resident orca pods or their transient counterparts, and even humpback whales.
Harbor Seals
Harbor seals are by far the most commonly encountered marine mammals in the San Juan Islands. Unlike sea lions, they live in the Salish Sea year-round and are often spotted sunbathing on rocky reefs, secluded beaches, and small islands during low tide. They’re naturally curious animals and will occasionally surface near kayaks to investigate before quietly slipping beneath the water again. Harbor seals give birth to their pups during the summer months, making it especially important to observe them from a respectful distance and avoid disturbing resting animals.
California & Steller Sea Lions
While often mistaken for seals, sea lions are larger, noisier, and much more social. California sea lions are common seasonal visitors to the San Juan Islands, while the much larger Steller sea lions also frequent the region, particularly outside of their breeding season. Both species can often be found resting on offshore rocks, reefs, and navigation buoys between feeding trips. Their barking frequently gives away their location long before they’re visible.
Orcas
No wildlife sighting captures the imagination quite like an orca. The San Juan Islands lie within the range of both the endangered Southern Resident orcas and Bigg’s (transient) orcas. Southern Residents primarily feed on Chinook salmon, while Bigg’s orcas hunt marine mammals such as seals and porpoises. Their movements change throughout the year as they follow their prey, making every sighting unique. Observing wild orcas is one of the most unforgettable experiences the Salish Sea has to offer.
Harbor Porpoises & Humpback Whales
Harbor porpoises are among the most overlooked marine mammals in the Salish Sea. Smaller than dolphins and much more reserved, they often surface quietly before disappearing beneath the water just as quickly. Humpback whales, on the other hand, have become an increasingly common seasonal visitor. Although sightings are less frequent than seals or porpoises, watching one surface or lift its tail above the water is an experience few visitors forget.
North American River Otters
Despite their name, North American river otters are just as comfortable in the saltwater environment of the San Juan Islands as they are in freshwater rivers. They’re occasionally spotted darting along rocky shorelines, swimming between kelp beds, or searching for fish, crabs, and shellfish. Fast-moving and endlessly entertaining, they’re often one of the most memorable wildlife encounters of the day.
Birds That Make the Islands Their Home
The San Juan Islands’ rocky shorelines, mature forests, coastal bluffs, and offshore islets provide nesting habitat for dozens of resident and migratory bird species. Whether you’re an experienced birder or simply enjoy watching wildlife, there’s almost always something soaring overhead or calling from the shoreline.
Bald Eagles
The bald eagle has become one of the defining symbols of the Pacific Northwest, and the San Juan Islands support one of the healthiest populations in the contiguous United States. Large stick nests are often built high in Douglas-firs overlooking the shoreline, with many pairs returning to the same nest year after year. While kayaking, it’s common to spot eagles perched in tall trees, scanning the water for fish, or soaring above the islands on rising air currents.
Great Blue Herons
Great blue herons spend much of their day stalking fish and crustaceans through shallow bays, eelgrass beds, and tidal flats. During the breeding season, they gather in nesting colonies known as heronries, typically located high in mature trees away from disturbance. Their slow wingbeats and distinctive silhouette make them one of the easiest birds to recognize on the water.
Ospreys
Every spring, ospreys return to the San Juan Islands after wintering farther south. Unlike eagles, they feed almost exclusively on fish, hovering above the water before plunging feet-first to capture their prey. Their large stick nests can often be seen atop dead trees, navigation markers, and specially built nesting platforms throughout the islands.
Cormorants
Several species of cormorants inhabit the San Juan Islands, where they spend much of their time diving beneath the surface in pursuit of fish. After feeding, they’re frequently seen standing on rocky outcrops with their wings spread wide to dry in the sun. Their excellent underwater swimming ability allows them to pursue prey far below the surface.
Pigeon Guillemots & Rhinoceros Auklets
These two seabirds are uniquely adapted to life along the rocky Pacific coastline. Pigeon guillemots nest among shoreline rock crevices and are often spotted swimming low in the water before diving after small fish. Rhinoceros auklets spend much of the year at sea but return to offshore islands during the breeding season, where they raise their chicks in underground burrows dug into forested slopes and grassy hillsides.
Belted Kingfishers
Few birds announce their presence quite like the belted kingfisher. Their unmistakable rattling call often echoes across quiet coves before the bird comes into view. Kingfishers patrol shorelines searching for fish, hovering briefly before diving headfirst into the water. Unlike many birds, they excavate nesting burrows directly into sandy or earthen banks rather than building nests in trees.
Life Beneath the Surface
While whales, seals, and seabirds often steal the spotlight, some of the Salish Sea’s most fascinating wildlife lives just beneath the surface. Extensive kelp forests sway with the tides, providing shelter for countless fish, crustaceans, and invertebrates. Colorful sea stars and anemones cling to rocky shorelines, while crabs scuttle across the seafloor and among tidal pools. During certain times of the year, translucent moon jellyfish drift with the currents, adding another layer to the underwater landscape.
The Salish Sea also supports an incredible diversity of fish. Pacific salmon migrate through these waters on their journey between freshwater rivers and the open ocean, forming the foundation of the region’s marine food web. Beneath rocky reefs, several species of rockfish find refuge among cracks and ledges, while herring and other forage fish sustain everything from seabirds and seals to humpback whales and orcas. Even when the water appears calm, an entire ecosystem thrives beneath your kayak. While you won’t always see it from the surface, every wildlife encounter above the water is connected to the rich marine environment below.
When Is the Best Time to See Wildlife?
One of the best things about visiting the San Juan Islands is that wildlife can be found year-round. Every season offers something a little different, making it difficult to pick a single “best” time to visit.
Spring brings the return of migratory birds, nesting ospreys, and increasing marine activity as the waters begin to warm. Summer offers excellent opportunities to spot harbor seals, seabirds, and whales while enjoying long daylight hours and generally calmer conditions on the water. As fall arrives, salmon migrations attract hungry eagles, seals, and Bigg’s orcas, while California and Steller sea lions become more common throughout the islands. Winter may be quieter on the water, but it offers dramatic scenery, fewer visitors, and excellent opportunities to observe resident wildlife against the backdrop of snow-capped mountains.
Because wildlife movements are influenced by tides, weather, food availability, and seasonal migrations, no two kayaking trips are ever exactly alike. That’s part of what makes every day on the Salish Sea a new experience.
How to Watch Wildlife Responsibly
Seeing wildlife in its natural habitat is a privilege, and protecting these animals begins with responsible viewing. Whether observing a harbor seal resting on a rocky shoreline or watching whales pass through the islands, giving wildlife plenty of space allows animals to behave naturally without unnecessary stress.
Sea kayaks are uniquely suited to low-impact wildlife viewing because they move quietly through the water without engine noise. Even so, it’s important to avoid approaching, chasing, or surrounding animals, and to follow all local regulations regarding marine mammal viewing distances. Practicing Leave No Trace principles and respecting sensitive shoreline habitats helps preserve the San Juan Islands for future generations of wildlife and visitors alike.
Guided kayaking trips also provide an added layer of stewardship. Experienced naturalist guides understand local wildlife behavior and know how to position groups for memorable encounters while minimizing disturbance to the animals.
Experience the Wildlife of the San Juan Islands with San Juan Kayak Expeditions
For more than four decades, San Juan Kayak Expeditions has helped visitors experience the remarkable wildlife and landscapes of the Salish Sea. Every trip is different. Some days are filled with curious harbor seals and soaring bald eagles, while others are defined by unforgettable encounters with whales or playful river otters.
Whether you’re joining a half-day paddle, a full-day adventure, or a multi-day kayaking expedition, our knowledgeable guides help you safely explore one of North America’s most extraordinary marine ecosystems while sharing the natural history, wildlife, and conservation stories that make these islands so special.
