Are there any trail closures or significant obstacles?

As of [March 28](https://www.wta.org/go-hiking/trip-reports/trip_report-2026-03-28.130705379233), the last couple hundred yards of the elevated boardwalk on the Heron Loop trail to the viewpoint was closed and gated. A detour through the eastern edge of the dog park is available. Other trails consist of a mix of paved, woodchip, dirt, and boardwalk, with no other blocking issues reported on March 28.

What is the status of mosquitoes or other biting insects?

Mosquitoes were encountered in long grasses and bushes leading to the waterfront overlook on [May 24](https://www.wta.org/go-hiking/trip-reports/trip_report-2026-05-24.111825573109), and were also noted as a significant complaint in longer grasses on [May 10](https://www.wta.org/go-hiking/trip-reports/trip_report-2026-05-10.120057385618). Bug spray or a head net is recommended for these areas, as they are less of an issue once you reach the lakefront boardwalk.

Is the heronry active and what is the approximate number of nests?

The big heron rookery is very active, with the number of nests significantly up from previous years. As of [March 28](https://www.wta.org/go-hiking/trip-reports/trip_report-2026-03-28.130705379233), at least 80, maybe 85 total nests were counted, which is a notable increase from the mid-60s in prior years. This indicates a thriving population of great blue herons.

Marymoor Park

Puget Sound and Islands

updated 4 months ago

Marymoor Park offers a mix of paved, gravel, and boardwalk trails. As of May 24, parking is $1 per car and kiosks accept dollar bills. The roads and parking lots are in great shape. Mosquitoes can be present in long grasses, especially near the waterfront overlook, but are less bothersome on the lakefront boardwalk. The heronry is very active, with the number of nests significantly increased compared to previous years, estimated at 80-85 as of March 28. A portion of the Heron Loop trail boardwalk out to the viewpoint was closed as of March 28, but a detour is available. The park is easily accessible by light rail.

Generated from 10 trip reports. Trails change faster than reports do, so check anything you’d turn around for.

What hikers ask about Marymoor Park

Generated from the most recent trip reports, newest 4 months ago. Check anything you’d turn around for.

No trip reports on this trail in 4 months, so everything below is at least that old.

Parking at Marymoor Park costs $1 per car, and the kiosks accept dollar bills as of May 24. Parking is generally plentiful, although some areas may be designated for specific activities like model airplanes, as noted on March 28.