When most people book a trip with Oceanside Adventures, they have one specific goal in mind: seeing a whale. Whales are only part of it. The water off Oceanside holds dolphins, sea lions, seabirds and more all year.
Because Oceanside sits adjacent to deep-water trenches that push nutrient-rich water up to the surface, it draws a lot of sea life. Here is what you might see on a cruise, whales and otherwise.
The Giants (Whales)
Oceanside is uniquely positioned along the “Marine Highway,” giving us year-round opportunities to spot different species of whales depending on the season:
Gray Whales (November to April): Our main winter and spring whale. Gray whales migrate thousands of miles between the Arctic and Baja California and often pass close to the Oceanside shore.
Blue Whales (May to November): The largest animals that have ever lived. They come in summer to feed on krill, and their straight-up blow can reach 30 feet.
Fin Whales: Known as the “greyhounds of the sea,” these fast, sleek whales are the second-largest animal on Earth and are seen off our coast all year.
Humpback Whales: The acrobats of the whale world! Humpbacks are famous for their dramatic breaches and surface tail slaps. We see them year-round, with a strong peak in the fall.
Minke Whales: These smaller, elusive whales are fast and unpredictable, but always a treat to spot darting through the water.
🐬 The Acrobats (Dolphins)
Southern California boasts some of the highest dolphin populations in the entire world. In fact, we have a 95%+ chance of encountering dolphins on every trip!
Common Dolphins: They travel in groups that can number in the hundreds or thousands, and often ride the wake of the boat.
Bottlenose Dolphins: The classic, larger dolphins you likely recognize from movies. They tend to stick closer to shore in smaller, tighter pods.
Risso’s Dolphins: These larger, blunt-nosed dolphins are born gray but turn white as they age due to the accumulation of battle scars from their favorite food: squid!
Pacific White-Sided Dolphins: Fast and acrobatic, with black and white “suspenders” markings along their sides.
🦭 The Oddballs & Locals (Non-Whales)
You don’t have to look hard to find the locals hanging out just past the Oceanside Harbor jetties.
Mola Mola (Ocean Sunfish): One of the strangest fish in the sea. They look like giant, flat pancakes with fins. You will often see them floating sideways on the surface of the water, sunbathing to warm up after deep dives.
California Sea Lions: You’ll likely hear them barking before you even leave the harbor! These playful “sea dogs” love to lounge on the bait receivers and navigation buoys.
Sharks: While rarer to spot from the surface, sharp-eyed passengers occasionally catch a glimpse of a Mako, Thresher, or even a juvenile Great White cruising the coastal waters.
🦅 The Aerial Assault (Birds)
Don’t forget to look up! Our naturalists actually use pelagic (ocean-going) birds as a treasure map to find the whales and dolphins.
Brown Pelicans & Cormorants: If you see a massive flock of these birds dive-bombing the water, there is a bait ball below. And where there is bait, there are usually dolphins or whales pushing them to the surface!
Terns & Gulls: These agile flyers hover over the chaos of a feeding frenzy, picking up the scraps left behind by the marine mammals.
Seals Near the Jetties
Harbor seals are shyer than sea lions. Look for them resting on the rocks of the jetties as we leave and return to Oceanside Harbor.
