Tillamook Bay is the largest estuary in Oregon, a shallow coastal bay fed by five rivers: the Miami, Kilchis, Wilson, Trask, and Tillamook. The paddling experience is defined by its extensive, spider web-like network of inlets, sloughs, and tidally influenced rivers, offering over 200 miles of navigable waterways suitable for kayaks, canoes, and stand-up paddleboards. The bay itself is quite shallow, so timing your trip to avoid the hours near low tide is essential to prevent grounding. The entire system is tidal, and paddlers must consult tide tables before heading out, as currents can be strong, particularly in the narrow river channels and at the bay's mouth. A notable hazard is the ocean bar at the bay's entrance near Bar View, which features large, life-threatening breaking waves and significant tidal rips through the narrow channel; this area is for expert paddlers only in specific conditions.

Key launch sites include the public dock at Garibaldi, which provides access to the wider bay, and Memaloose Point Boat Launch on Bayocean Road, which offers improved facilities for Tillamook Bay and the Tillamook River. For exploring the interconnected rivers and sloughs, put-ins at Sue H. Elmore Park or Carhahan Park in Tillamook provide access to Hoquarton Slough and the Trask River. A rocky beach across from Lumberman’s Memorial Park in Garibaldi serves as a launch during higher tides. The bay's west side near the Three Graces rock formations is a destination for more advanced paddlers, attracting seals, seabirds, and rich intertidal life, but requires careful planning around current and swell. During the fall Chinook fishing season, the bay can host hundreds of fishing boats, necessitating awareness and space-sharing.

Water temperatures are consistently cold, typically reported in the mid-50s Fahrenheit. The scenery transitions from the small harbor town of Garibaldi to expansive mudflats, marshes, and forested shorelines. Wildlife sightings commonly include harbor seals, jumping salmon, ospreys, pelicans, bald eagles, and a variety of wading birds. Paddlers should note that oyster beds within the bay are part of a commercial shellfish preserve and are not to be disturbed. For comprehensive trip planning, the waterproof guidebooks published by the Tillamook Estuaries Partnership detail access points, routes, and safety information for the entire watershed.