| Ryan Lake Trail | Gifford Pinchot National Forest | 0.6 |
| The interpretive loop initially climbs, offering views of Ryan Lake. The trail loops around the ridge, giving hikers views of the Green River Valley and Mt. Margaret Backcountry. Interpretive signs help explain the 1980 eruption and the salvage logging... |
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| Safety Harbor Creek Trail | Wenatchee National Forest | 4.5 |
| The trail tread begins at the end of an old reclamation road bed near South Navarre Campground, and winds up along Safety Harbor Creek to the junction with the Uno Peak Trail. |
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| Saint Helens Way | | |
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| Salmo Basin Trail | Colville National Forest | 8.8 |
| The trail is within the Salmo-Priest Wilderness with moderate to steep sustained trail grades for several miles at a stretch. Old growth cedar/hemlock will be found in the Salmo Basin. The first three miles of trail is the most heavily visited part of ... |
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| Salmo Divide | Colville National Forest | 3 |
| The first mile of the trail is an old road bed (formerly a section of road 2220). The remaining two miles of trail follow an open ridge at 6200 to 6400 feet elevation. |
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| Salt Creek | Gifford Pinchot National Forest | 4 |
| Beginning from Road 8031, this lightly used trail follows Road 060 (closed to vehicle travel) for 1 mile, then enters the Mt. Adams Wilderness. The trail is maintained for 3 miles, ending near the confluence of Cascade and Salt Creeks. |
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| Salt Creek Trail | Gifford Pinchot National Forest | 4 |
| Salt Creek Trail is 4 miles long and located in the Morrison Creek area. |
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| Salter Trail | | |
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| Sand Lake | Gifford Pinchot National Forest | 3.8 |
| Starting from or Road 1284, the Sand Lake Trail climbs steeply through dense forest before entering the William O. Douglas Wilderness. (There is a vehicle turnaround area .2 miles past the trail.) It takes an even grade towards Cortright Point. Turning... |
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| Sand Lake Trail | | |
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| Sand Ridge Trail | | |
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| Sasse Mountain Trail | | |
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| Sauk Lake Trail | Mt. Baker-Snoqualmie National Forest | 3.5 |
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| Sauk Mountain Trail | Mt. Baker-Snoqualmie National Forest | 2.1 |
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| Sawmill Ridge Trail | | |
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| Sawtooth Trail | Gifford Pinchot National Forest | 2 |
| Sawtooth Trail is 2 miles long and located in the Indian Heaven Wilderness. |
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| Schaefer Lake Trail | Wenatchee National Forest | 5 |
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| Schalow Trail | Okanogan National Forest | 3 |
| A nice hike out of Sugarloaf campground, trail goes to the top of Schalow Mountain. A great view of surrounding mountains. |
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| Scott Paul Trail | Mt. Baker-Snoqualmie National Forest | 6.5 |
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| Second Beach Trail | Olympic National Park | 0.8 |
| Second Beach Trail begins on the LaPush road, fourteen miles west of U.S. 101. The trail goes .8 mile to a sandy beach with tidepools and views of sea stacks. |
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| Service | Gifford Pinchot National Forest | 4.2 |
| This trail begins on Road 8821 and follows an old skid road for 1 mile through open stands of spruce to Deadhorse Meadow. The trail crosses Road 8831 and enters a harvest unit, then continues across Smoky and Little Goose Creeks before ending on Trail ... |
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| Service Trail | Gifford Pinchot National Forest | 4.2 |
| Service Trail is 4.2 miles long and located in the Berry Fields area. |
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| Seventeenmile Trail | | |
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| Shadow of the Sentinels Trail | Mt. Baker-Snoqualmie National Forest | 0.5 |
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| Shannon Ridge Trail | Mt. Baker-Snoqualmie National Forest | 3 |
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