Starting Wednesday, Oct. 14, the Narrow Street surface lot at Sumner Station closes to everyone except the drivers using its four ADA spots at the entrance. It stays closed until Sound Transit finishes the garage on Harrison Street. To make up for it, 20 new regular spaces open near Harrison Street two days earlier, on Monday, Oct. 12.
That's the whole announcement. Behind it is a simple fact about how this project works. Sumner's new parking is being built on top of Sumner's old parking, so the station has to lose spaces before it gains them. For the next few months, riders who know the rules of each remaining option will have an easier morning than riders who don't.
What changes, and when
Sound Transit sent its construction alert on Oct. 2, 2026. The details are short enough to fit in a table.
| Date | What happens | Who it's for |
|---|---|---|
| Monday, Oct. 12 | 20 new spaces open near Harrison Street, in front of the garage construction area | Anyone. These are regular spaces, not ADA or permit spaces |
| Wednesday, Oct. 14 | Narrow Street surface lot closes for construction | All drivers, except users of the four ADA spots at the lot entrance |
| When construction ends | Narrow Street closure lifts | Everyone |
There's one gap in that alert that matters. It doesn't list which other lots remain or name any overflow parking. The 20 Harrison Street spaces are the only new parking it announces. If you've parked at Narrow Street for years, check your backup before Oct. 14, not on the morning of.
The one space that's held for you before 10 a.m.
Once the Narrow Street lot closes, most of the parking left near the platform is first-come, first-served. The carpool zone is the exception.
Sound Transit still offers free carpool permits at Sumner Station. On weekdays from 4 to 10 a.m., the permit area is reserved for vehicles carrying at least two transit riders. After 10 a.m., and all day on weekends and holidays, it opens to anyone on a first-come basis.
Regular S Line service runs on weekdays, so that 4 to 10 a.m. window covers the trips that matter for a commute. If you have a spouse, a neighbor or a coworker who also rides Sounder, those morning hours are when the permit pays off.
Here's how the options stack up for a weekday morning rider this fall:
- Carpool permit zone. Reserved 4 to 10 a.m. on weekdays for permitted vehicles with two or more transit riders. The permit is free.
- The 20 new Harrison Street spaces. Open to anyone from Oct. 12. There are only 20 of them, and they sit right next to the construction site.
- The four ADA spots at the Narrow Street entrance. These stay open through construction for drivers who qualify.
- Bonney Lake Park & Ride with ST Route 596. The City of Sumner points commuters to this pairing as a way to reach the station. Sound Transit lists the Bonney Lake lot at 356 spaces. That's its capacity, not a live count of open spaces, and the City warns that commuter parking options often fill.
Why parking a few blocks away isn't a workaround
Once the station fills, you might be tempted to park on a nearby residential street or in a downtown lot. Sumner has already planned for that. The City says neighborhoods near the station have Restricted Parking Zones that protect parking for residents. Downtown public lots and street parking also have posted time limits. A time-limited spot on Main Street won't last through a round trip to Seattle.
If you live inside one of those zones, the rules work in your favor this fall. The City's parking page explains how the RPZ program works. Bookmark it if a car you don't recognize starts showing up out front every weekday.
The trains stayed the same this fall
Sound Transit's fall 2026 service change took effect Aug. 29, and the agency said it had no changes planned for the S Line. The parking shuffle in October comes on top of a train schedule that didn't change this fall, so your parking plan is the part that needs updating.
What the garage adds when it opens
The garage is the reason for this squeeze. It's going up on the east side of the tracks on Harrison Street. When it's finished, it will be four and a half floors with about 600 stalls and electric vehicle charging stations. A new pedestrian plaza will connect it to the Sounder platform.
When Sound Transit awarded the contract in 2023, it put the design at 602 stalls and 505 net new spaces for the station. Those two numbers are the same story as this fall's lot closure. The garage takes over ground that already held parking, so some of its stalls replace spaces that are there today. Even so, the station should come out of this with several hundred more spaces than it has now.
The garage will also be easy to spot from the platform. Sound Transit commissioned artwork by Paz de la Calzada, a San Francisco-based artist. Her design for Sumner puts camas, the purple wildflower native to Washington, into the glass of the garage's stair and elevator tower. Sound Transit says the tower will be visible across the new plaza. Harbor Pacific Constructors is leading construction, and Brooks + Scarpa and Stantec are the architects.
The project goes beyond the garage itself. Sound Transit's work in Sumner includes better sidewalks and upgraded lighting around the station area. It also paid for a new sidewalk and multiuse path at the Traffic Avenue/SR 410 interchange, about a quarter mile west of the tracks, as part of the City's new bridge there.
How long the gap may last
The opening date has moved. Earlier project materials aimed for early 2026. In November 2025, Sound Transit said the garage was about 45 percent complete, with crews working on the second of four floors, and still scheduled to open in 2026. Sound Transit's project page now says it expects the garage to open to the public in late 2026 or early 2027.
That means the Narrow Street closure that starts Oct. 14 could run into the new year. Plan for a few months of tighter mornings, not a couple of weeks.
Sound Transit sends construction alerts for this project by email. The Oct. 14 closure was announced that way, so signing up from the project page is the easiest way to hear first when the garage opens or the Narrow Street lot comes back.
A second downtown change on the same timeline
There's more coming to the station area. Huxdotter Coffee is planned for 921 Alder Ave. at Main Street, in the former Bank of America building. Plans call for a full kitchen, beer and wine later in the day, indoor and sidewalk seating, and two drive-through lanes. A financial-group office is planned for the back of the building. The News Tribune reported in July 2026 that the developer was aiming to finish the building by the end of 2026, but that the café would more likely open in early 2027.
If both schedules hold, a new place for coffee and a garage with about 600 stalls will open in downtown Sumner within a few months of each other.
Projects like the Sumner Station garage change what a home near downtown offers, and a good valuation should account for them. If you live near the station and wonder how that access affects your home's value, Bobbie Jo Sells Homes is happy to walk you through it. Get your free home valuation whenever you're ready.
This article is general information, not legal, tax or financial advice. Consult a qualified professional about your situation.
