Birch Bay State Park in Washington, USA - map and visitor information

Research checked: 2026-10-29. Check linked official notices before travel.

Birch Bay State Park in Blaine, Washington, pairs a saltwater shore with the short Terrell Marsh Interpretive Trail. It suits a beach-and-nature day without committing to a long hike. Use Helweg Road for the state park, and plan vehicle parking around the Discover Pass requirement.

Shore views and a short marsh walk

Combine the half-mile Terrell Marsh Interpretive Trail with time on the shore. Four displays explain the trail setting. On a clear day, look toward the North Cascades and Canadian Gulf Islands; views depend on weather, so the marsh gives the visit a second focus.

Know before you go

Fees, hours, and seasonal access

Plan for the shore and changing conditions

Choose a shore walk that lets your group return before dusk. Do not treat a shellfish beach as automatically safe for harvesting: biotoxin closures can affect clams, mussels and oysters. A recreational license is required, and the park directs harvesters to check the current Department of Health shellfish safety map.

Keep the marsh and day-use area protected

Keep dogs leashed and use the trail for your marsh walk. Follow the current fire notice, even if a picnic area has a grill. Observe the shore and wetland setting without disturbing animals or vegetation.

Tables and a reservable shelter

Ordinary picnic tables are first come, first served. For a group that needs a covered space, the upper day-use area has a reservable shelter. Check the shelter and pass arrangements through the official Birch Bay park page before organizing the visit.

Find the Helweg Road entrance

Use 5105 Helweg Road, Blaine, WA 98230, to reach this state park. Select the state park destination rather than a generic Birch Bay location. Once there, combine the shore with the half-mile Terrell Marsh trail instead of assuming every beach access in the bay belongs to the park.

Other day-use parks near Blaine

Semiahmoo Park, a Whatcom County site at 9261 Semiahmoo Parkway, opens daily from 8 a.m. to dusk. Peace Arch Historical State Park is at 19 A Street in Blaine and opens 8 a.m. to dusk year-round; its vehicle parking requires a Discover Pass. Check the road approach and destination parking before making either a separate stop.

Build a simple day visit

• Walk the half-mile Terrell Marsh Interpretive Trail and use its displays to understand the setting.
• Spend time on the shore and look for distant mountain or island views when the weather permits.
• Use a first-come picnic table, or arrange the covered shelter ahead for a group.

Day-use services

The park lists accessible restrooms and drinking water, along with picnic tables and the covered shelter. Confirm the facilities and route your group needs before arrival, especially for an off-season visit. These day-use suggestions do not establish the operating season of individual campsites.

About the bay and marsh setting

Washington State Parks manages this coastal park near Blaine. Its shore views and the Terrell Marsh trail let visitors experience two different settings within a short day visit.

Watch the shore and marsh quietly

Use the interpretive displays to understand the marsh habitat, then pause to observe the shore. Clams, mussels and oysters also form part of the park’s coastal setting. Seeing shellfish does not establish that collecting them is safe or permitted under current conditions.

Contact

Call 360-371-2800 or email [email protected] for the park. Ask about seasonal gate hours, the shelter or any condition on which your day visit depends.