West Hylebos Wetlands Park
🏆🏆🏆🏆🏆 Urban Ancient Wetland — 120-acre ancient peat bog inside the city of Federal Way — a 10,000-year-old wetland surrounded by suburban development
West Hylebos Wetlands Park protects 120 acres of ancient peat bog inside the city of Federal Way — a suburb of Seattle-Tacoma. This 10,000-year-old wetland is a living time capsule — core samples reveal 30 feet of peat accumulated since the last Ice Age. The bog preserves ancient stumps of western red cedar and Sitka spruce submerged in acidic, oxygen-free peatwater that prevents decomposition. The wetland supports rare plants including Labrador tea, sundews (carnivorous!), and sphagnum moss — species more commonly found in Alaska. A 1-mile boardwalk traverses the bog.
Visitor Information
| Detail | Information |
|---|---|
| Location | Federal Way, WA (Seattle suburb!) |
| Entry Fee | Free |
| Age | 10,000 years — 30ft of peat! |
| Plants | Alaskan species in suburbia! |
About West Hylebos Wetlands
West Hylebos Wetlands Park in Federal Way preserves a remarkable urban wetland ecosystem — a peat bog that has been accumulating plant material for over 10,000 years since the last Ice Age. The park features a 1-mile boardwalk trail through the wetland, passing ancient trees and bog habitat that harbors unique plant species including sundews and Labrador tea.
Things to Do
Walking the elevated boardwalk through the 10,000-year-old peat bog, birdwatching, nature photography, and learning about wetland ecology at the interpretive stations. The park hosts educational programs about this remarkably preserved Ice Age ecosystem in the heart of suburban Puget Sound.
Insider Tips
Urban wetland: West Hylebos preserves a remarkable wetland ecosystem in Federal Way — between Seattle and Tacoma. Pro tip: The boardwalk trail passes through a peat bog containing 10,000-year-old stumps — trees that grew when glaciers still covered Puget Sound. Ancient forest: The preserved stumps are Douglas fir and western red cedar from the earliest post-glacial forest — a time capsule from when humans first arrived in the Pacific Northwest.
Best Time to Visit
Year-round: Boardwalk accessible in all weather. Spring: Wetland wildflowers and returning birds. Summer: Lush vegetation. Fall: Fall color in the bog.
Frequently Asked Questions
How are 10,000-year-old stumps preserved?
The acidic, oxygen-poor water in the peat bog prevents decay — organic matter is preserved for millennia. The stumps grew during the earliest post-glacial period when pioneer trees colonized the freshly exposed landscape. As the bog developed, rising water levels killed the trees and the peat preserved them. These stumps are contemporaries of the earliest human settlements in Washington.
🌿 Visit West Hylebos Wetlands
10,000-year-old bog IN suburbia — Alaskan plants near Seattle!
Wildlife & Nature
West Hylebos Wetlands Park — 120 acres in Federal Way (King County) — protects one of the last undisturbed lowland peat bogs in the Puget Sound region. The park’s boardwalk trail winds through sphagnum bog, old-growth western red cedar, and rare bog habitat. Sundew and Labrador tea — carnivorous and aromatic bog plants — grow here. Pacific tree frogs chorus in spring. Pileated woodpeckers drum in the old-growth. Great blue herons fish the wetland ponds. The park preserves a fragile ecosystem surrounded by suburban development.
Nearby Attractions
Federal Way is adjacent with services. Dash Point State Park — 5 miles west — has saltwater beach and forest camping. Saltwater State Park — 5 miles north — has an artificial dive reef. Tacoma — 10 miles south — has the Museum of Glass. Wild Waves Theme Park is nearby.
