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North Slope

Mountain bike trail conditions · Seattle & Snoqualmie, WA 47.049° N  123.194° W   781 FT Verified

PRIME: Rideable now

Thu 24 Conditions turn Caution.

Recent rain
0.1″ of rain, 7d ago
Today
73°Ffog or low cloud
  • Thu 9/10, no measurable rain, modeled conditions: PRIME
  • Fri 9/11, no measurable rain, modeled conditions: PRIME
  • Sat 9/12, 0.16 inches of rain, modeled conditions: PRIME then CAUTION
  • Sun 9/13, 0.10 inches of rain, modeled conditions: CAUTION then PRIME
  • Mon 9/14, no measurable rain, modeled conditions: PRIME
  • Tue 9/15, no measurable rain, modeled conditions: PRIME
  • Wed 9/16, no measurable rain, modeled conditions: PRIME
  • Thu 9/17, no measurable rain, modeled conditions: PRIME
  • Fri 9/18, no measurable rain, modeled conditions: PRIME
  • Sat 9/19, no measurable rain, modeled conditions: PRIME
  • Today, Sun 9/20, no measurable rain, modeled conditions: PRIME
  • Mon 9/21, no measurable rain, modeled conditions: PRIME
  • Tue 9/22, no measurable rain, modeled conditions: PRIME
  • Wed 9/23, no measurable rain, modeled conditions: PRIME
  • Thu 9/24, 0.30 inches of rain, modeled conditions: PRIME then CAUTION then STAY OFF, forecast preview, beyond the free window
  • Fri 9/25, no measurable rain, modeled conditions: STAY OFF then CAUTION, forecast preview, beyond the free window

Updated Sep 20, 2026, 13:15 UTC. Modeled hourly. Unchanged for 10+ days. Official closures and current trail conditions take priority.

Watch conditions at North Slope

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Is North Slope rideable today?

Yes. The live verdict is PRIME, rideable now. 0.1″ of rain, 7d ago.

CHANGED
Sun 139am
Dried back to PRIME.
Sun 134am
Rain moved in. Verdict dropped to CAUTION.
Over the tracked history, North Slope has been rideable on 10 of the last 10 days. Loam also considers soil, slope, tree cover, and drying time.

Soil and terrain at North Slope

North Slope is a mountain bike trail network in Seattle & Snoqualmie, WA. The soil is loam and drains well. Heavy tree cover can slow drying after rain. The terrain averages a 14.7° slope at 781 ft and mainly faces N. Its steep slopes shed water quickly after rain.

How we check ourselves

How these factors affect drying

SoilLoam

Loam balances drainage with water retention, so it typically takes a day or two to dry after meaningful rain.

CanopyDense 82%

Heavy tree cover shades the soil and blocks wind, so these trails dry slowly and can hold morning damp even after dry days.

TerrainSheds water

Water runs off this terrain rather than pooling, which helps the surface dry out after rain.

FAQ

Can you ride North Slope right now?

The current estimate for North Slope is PRIME: rideable now. No significant rain in the forecast. 0.1″ of rain, 7d ago.

Is North Slope muddy right now?

Loam currently estimates dry conditions (PRIME). 0.1″ of rain, 7d ago.

What is the soil and trail surface like at North Slope?

North Slope sits on loam soil that drains well. Loam balances drainage with water retention, so it typically takes a day or two to dry after meaningful rain.

How long does North Slope take to dry after rain?

North Slope usually needs about a day or two to dry after meaningful rain. Its terrain sheds water, which speeds drying. Heavy tree cover slows drying further.

Can you ride North Slope after rain?

Drying time depends on how much rain fell and the weather that follows. Wait until the surface is firm. Check the current estimate before heading out, and turn back if your tires leave ruts.

Does North Slope get snow in winter?

Yes. At 781 ft, North Slope typically sees winter snow and freeze-thaw that can pause riding. Loam flags a FROZEN state when the ground is snow-covered or frozen, then clears it as things thaw and dry.

What's the terrain and elevation like at North Slope?

North Slope sits at roughly 781 feet, faces mostly N, and averages a 14.7° grade with about 82% tree cover. It is slower to dry where it faces north, and the steep terrain sheds water quickly.

When is the best time of year to ride North Slope?

Snow can limit riding at North Slope in winter, at around 781 feet. Spring snowmelt and fall freezes can also affect conditions. Its shady aspect means it needs longer after storms than sunnier networks nearby. Check the current conditions before planning a ride.

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Network profile

Network profile

Soil
Loamdrains well
Drainage
Sheds waterdries quickly
Tree cover
82%Dense
Elevation
781 ft
Average grade
14.7°
Predominant aspect
N-facing

Around North Slope

Nearby networks

Capitol Forest7 MI Millersylvania State Park16 MI 360 Park34 MI Swan Creek Park39 MI Dash Point State Park41 MI

Every Seattle & Snoqualmie network →

Trail stewards

Trail work here is done by Friends of Capitol Forest. Support your local builders.