Loam
Puget Sound lowlands and Cascade foothills
Duthie Hill and Lord Hill sit closer to the lowlands, while Tiger Mountain, Raging River, and Capitol Forest climb into wetter, shaded terrain. Dense conifer cover keeps sun and wind off the tread. A break in the rain may not be long enough for the ground to dry.
Cowiche Canyon and other central Washington destinations remain in the full Seattle and Snoqualmie directory, but their weather should be checked separately.
What affects drying time
Tree cover
Canopy ranges from 0% to 84% across the full regional directory. Heavily shaded trails usually need more drying time.
Slope
Steeper ground sheds water, but flat stretches, drainage crossings, and low spots can stay soft.
Elevation
The foothills can hold snow and frozen ground after trails near the Sound have thawed. Check the network you plan to ride.
Before you ride
Check the Washington DNR Tiger Mountain and Raging River notice or the relevant park or county notice. If the trail is open, compare the latest condition estimate with what you find on arrival. Turn back if your tires sink into the tread.
Loam estimates conditions from recent weather, soil, terrain, and tree cover. Use the network pages below to check the latest estimate before you leave, then use the trailhead firmness check when you arrive.
Seattle trail conditions
79% tree cover near the mapped location. Slope: 0.2°. Elevation: 168m.
83% tree cover near the mapped location. Slope: 6.8°. Elevation: 714m.
82% tree cover near the mapped location. Slope: 7.8°. Elevation: 727m.
81% tree cover near the mapped location. Slope: 2.3°. Elevation: 169m.
84% tree cover near the mapped location. Slope: 13.6°. Elevation: 471m.
Sources and method
Loam estimates conditions from weather, soil, and terrain. It does not measure the trail surface directly or override an official closure. Read how the estimate works and see the published checks and their limits.
- USDA NRCS: Hydrologic Soil Groups, soil infiltration and runoff.
- USGS: Infiltration and the Water Cycle, saturation, land cover, and slope.
These references explain physical processes, not the accuracy of Loam's predictions.
