On a normal Seahurst afternoon the tideline sits where you expect it, a few strides past the driftwood. For six days this month, starting Friday, July 11, it will not. The water pulls back far enough to expose a second park that most residents have walked past for years without ever meeting: a low shelf of eelgrass, moon snails, sculpins, and the kind of chalky sand dollars that only surface when the Sound drops below zero. If your calendar has any give in it between the 11th and the 16th, this is the week to use it.
The reason the window matters is that Seahurst is a bluff park with a short, steep beach. When the water is high, the walkable strand is narrow enough that a family with a stroller and a dog on a leash starts feeling crowded near the picnic shelters. When the water drops to minus three or minus four, the same beach becomes a wide, textured flat you can wander for an hour without doubling back. The park effectively doubles in size for a few hours, and then it closes back up.
The Window, by the Hour
The Environmental Science Center publishes its naturalist schedule to line up with the lowest predicted tides of each month. Here is the July window, with the tide level at the bottom of each pull:
| Date | Naturalists on beach | Predicted low tide |
|---|---|---|
| Sat, July 11 | 8:30–10:30 a.m. | +2.3 |
| Sun, July 12 | 9:00–11:30 a.m. | -3.2 |
| Mon, July 13 | 9:30 a.m.–12:30 p.m. | -3.7 |
| Tue, July 14 | 10:00 a.m.–1:00 p.m. | -3.8 |
| Wed, July 15 | 10:30 a.m.–1:30 p.m. | -3.5 |
| Thu, July 16 | 12:00–2:00 p.m. | -2.7 |
The published schedule for July runs July 11 through July 16, with the pulls stepping later each morning and the lowest reading of the sequence at -3.8 on July 14. For context, this is a milder window than June was. The lowest tides of the entire 2026 season were a -4.3 on June 15 and a -4.2 on June 16. If you missed those, July 14 is the next closest thing.
The first morning of the window, July 11, is the outlier. The predicted low is a positive number, which means the naturalists will be on the beach but the far shelf will still be underwater. Treat that one as a warm-up. The real exposure begins Sunday morning and holds through Wednesday afternoon.
What the Brown Vests Are Actually For
The people in brown vests standing between the picnic shelters and the water are not park rangers, and they are not there to run a program you sign up for. They are volunteer and staff naturalists from the Environmental Science Center, and their job during the low-tide window is essentially to translate. If you point at something, they tell you what it is, whether it is safe to touch, and what it eats. If you have a five-year-old who has never seen a chiton, they will find one and put it in a bucket of seawater long enough for your kid to look at it before it goes back where it came from.
The Environmental Science Center hosts the free naturalist events at Seahurst Park Beach from April through August 2026, inviting residents to meet staff and volunteer naturalists on the beach where they help visitors explore safely, answer questions, and share stewardship tips, with multiple dates each month scheduled to coincide with low-tide conditions. No registration is required, and participants can drop in during the scheduled times. The events are underwritten by the City of Burien and 4Culture, which is the practical reason none of this costs anything for a Seahurst family that shows up with a bucket and curiosity.
Two things worth knowing that the schedule does not tell you. First, the naturalist window is wider than the actual low. If the tide bottoms out at 11:24 a.m., the naturalists will be there from about an hour before to an hour after, because the shelf stays exposed on both sides of the pull. Second, the far edge of the flat, the part where you find the sunflower stars and the biggest moon snails, is only accessible for maybe forty minutes on either side of the true low. If you want to see the good stuff, get there when they open, not when they close.
The Service Road Trick
The lower beach lot at Seahurst fills up fast during a minus tide. The main lot has 184 parking stalls, plus 5 accessible stalls in the lower lot, and on a warm July Sunday at 10 a.m. that is not enough.
The workaround is one that longtime residents have used for years and that WABI, the Walkable and Bikeable Burien group, formalizes on its guided walks. You park at the top of the hill and walk down. WABI's Walk-n-Talk route starts at the top of the hill and walks down the service road to Seahurst Beach, with the return trip climbing back up. The service road is a wide, paved grade with a gentle-to-moderate incline, shaded by the Douglas fir and bigleaf maple canopy most of the way down. Ten minutes down, fifteen back up if you are not in a hurry. The upper lot almost never fills.
From the bottom of the service road, the naturalists will typically be to your right, gathered near the restrooms. The Marine Science Center sits at the north end of the beach, which is left as you face the water. The Walk-n-Talk route often ends at the Marine Science Center at the north end of Seahurst Beach. If you have visitors in town and want to give them a compact tour, the loop of upper lot, service road, low-tide flat, Marine Science Center, and service road back is under two miles and takes most of a morning.
What the Park Actually Is
Some residents have lived in Seahurst for a decade without ever registering that the park has a formal name and a history. Seahurst Park, also known as Ed Munro Park after the state legislator who helped coordinate funding and resources for the park, was established in 1975. The original acquisition through King County Parks assembled 2,000 feet of waterfront. That waterfront is the reason the low-tide window feels the way it does. Most Puget Sound beaches in south King County are short pockets bracketed by private tideland. Two thousand contiguous public feet is a long walk.
The shoreline itself is not the shoreline it was fifty years ago. The upper beach was modified in the 1990s by adding native vegetation, logs, and rip-rap to restore a natural appearance and limit access to the beach. More recent restoration work, coordinated with the Natural Resources Conservation Service and the City of Burien, has focused on multi-year native seedling planting to return natural succession to the forest. This is why the trail down feels older than it is and why the beach transitions cleanly from forest to shelf without a hard edge.
After the 16th
If July 11–16 does not work, the naturalists will be back. The full 2026 program runs through August 12, and each subsequent low-tide window is published on the Environmental Science Center's site with dates and tide levels attached. For a Seahurst household with school-age kids, a rough rule of thumb: one weekday morning and one weekend morning per low-tide window is enough to know the park in a way most neighbors do not.
The other thing to add to a July calendar, if you like company on the walk down, is WABI's periodic Walk-n-Talk. The group runs a slow-paced service-road walk with a rotating environmental educator from the City of Burien, and the walks are free and open. The pace is genuinely slow, which is the point.
If you have lived in Seahurst long enough that the park feels ordinary, this is the week it stops feeling that way. The 14th is the one to circle.
When you are ready to talk about the home behind that walk, whether you are staying, selling, or looking for something with a better line to the water, Porter Group is happy to sit down over coffee. Contact Us.
