Little Si Trail Viewpoint – Mount Si Viewpoint loop from Tanner
Little Si Trail Viewpoint – Mount Si Viewpoint loop from Tanner
4.9
(1181)
16,288
hikers
Little Si Trail Viewpoint – Mount Si Viewpoint loop from Tanner
08:38
21.5km
1,070m
Hiking
Hard hike. Very good fitness required. Mostly accessible paths. Sure-footedness required. The starting point of the route is accessible with public transport.
Last updated: April 20, 2026
Tips
Temporary access restrictions
Includes segments with temporary access restrictions.
After 17.7 km for 55 m
Customers only
Waypoints
Start point
Bus stop
Get Directions
545 m
Little Si Trail Viewpoint
Highlight • Viewpoint
Tip by
1.17 km
Boulder Garden Loop Trail
Highlight (Segment) • Trail
Tip by
7.17 km
Base of Haystack Scramble
Highlight • Climb
Tip by
7.44 km
Mount Si Viewpoint
Highlight • Viewpoint
Tip by
21.5 km
End point
Bus stop
Way Types & Surfaces
Way Types
12.1 km
4.71 km
3.19 km
1.11 km
400 m
Surfaces
13.1 km
5.58 km
1.50 km
1.10 km
197 m
< 100 m
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Elevation
Highest point (1,190 m)
Lowest point (130 m)
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Weather
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Today
Wednesday 15 July
30°C
14°C
13 %
Additional weather tips
Max wind speed: 8.0 km/h
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Our route recommendations are based on thousands of hikes, rides, and runs completed by other people on komoot.
Description
If you're looking for a serious challenge that delivers big views, the Little Si Trail Viewpoint – Mount Si Viewpoint loop from Tanner hiking route is a difficult 13.4-mile (21.5 km) journey with a substantial 3504 feet (1068 metres) of climbing, taking around 8 hours and 38 minutes to complete. This Little Si Mount Si loop difficulty makes it perfect for experienced hikers ready for a long day on the trails, offering a comprehensive tour of the area's most popular peaks.
What to expect on Little Si Trail Viewpoint – Mount Si Viewpoint loop from Tanner
This challenging hike combines the best of both worlds, starting with the classic Pacific Northwest second-growth forest of Little Si, complete with moss-covered logs and sword ferns that some describe as "enchanted." You'll navigate steep inclines and switchbacks, eventually reaching the Little Si summit for panoramic views of the Snoqualmie Valley and Mount Si itself. The transition to Mount Si involves a significant "fitness slog" with a steep climb, but the reward is immense: stunning vistas from the Mount Si summit, including the Cascades and Mount Rainier. This route is a true test of endurance, best suited for confident hikers seeking a full-day adventure.
Planning your visit
Planning your visit requires a Discover Pass for parking at the Little Si Tanner trailhead parking area. Given the popularity of both Little Si and Mount Si, especially on weekends, arriving early is highly recommended to secure a spot. The best time to hike Little Si Mount Si Tanner is during the warmer, drier months to avoid slippery conditions on rocky sections, though the trail is mostly sheltered from inclement weather year-round.
Trail details
- Distance: 13.4 miles (21.5 km)
- Elevation gain: 3504 feet (1068 metres)
- Difficulty: difficult
- Estimated time: 8 hours and 38 minutes
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