The Montlake Fill, officially known as the Union Bay Natural Area, is a 74-acre restored wetland and grassland on the University of Washington campus that has become one of Seattle's most accessible and productive birding spots. Over 200 species have been recorded on this former landfill site where restored native habitat now borders the shores of Union Bay on Lake Washington.
The flat, easy trails wind through cattail marsh, willow thickets, and open grassland where Savannah Sparrows, Northern Harriers, and occasional Short-eared Owls hunt in winter. The lakeshore attracts a variety of ducks, grebes, and herons year-round, while spring and fall migration bring warblers, flycatchers, and shorebirds. The site is beloved by Seattle birders for its combination of convenience, diversity, and the ongoing story of habitat restoration.
When is the best time to visit Montlake Fill (Union Bay Natural Area) for birding?▼
The best months to visit Montlake Fill (Union Bay Natural Area) for birding are October-May. The best seasons are Winter and Spring.
What birds can I see at Montlake Fill (Union Bay Natural Area)?▼
Notable species at Montlake Fill (Union Bay Natural Area) include Savannah Sparrow, Northern Harrier, Pied-billed Grebe, Virginia Rail, Wilson's Snipe, Marsh Wren. The area supports wetland, grassland, lake, urban park habitats.
How difficult is birding at Montlake Fill (Union Bay Natural Area)?▼
Birding at Montlake Fill (Union Bay Natural Area) is rated as Easy. The trails and viewing areas are accessible for birders of all experience levels.
Is there an entrance fee at Montlake Fill (Union Bay Natural Area)?▼
There is no entrance fee at Montlake Fill (Union Bay Natural Area). Hours: Dawn to dusk daily.
What amenities are available at Montlake Fill (Union Bay Natural Area)?▼
Montlake Fill (Union Bay Natural Area) offers the following amenities: Trails, Parking.
