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Millersylvania State Park

Mountain bike trail conditions · Seattle & Snoqualmie, WA 46.914° N  122.915° W   210 FT Verified

PRIME: Rideable now

Thu 24 Conditions turn Caution.

Recent rain
0.1″ of rain, 7d ago
Today
74°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, 0.14 inches of rain, modeled conditions: PRIME then STAY OFF then CAUTION
  • Sun 9/13, 0.13 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, 0.40 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, 13:50 UTC. Modeled hourly. Unchanged for 10+ days. Official closures and current trail conditions take priority.

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Is Millersylvania State Park rideable today?

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

CHANGED
Sun 1312pm
Dried back to PRIME.
Sun 136am
Dried back to CAUTION.
Sun 134am
Rain moved in. Verdict dropped to STAY OFF.
Over the tracked history, Millersylvania State Park has been rideable on 10 of the last 10 days. Loam also considers soil, slope, tree cover, and drying time.

Soil and terrain at Millersylvania State Park

Millersylvania State Park is a mountain bike trail network in Seattle & Snoqualmie, WA. The soil here is organic. Heavy tree cover can slow drying after rain. The terrain averages a 1.5° slope at 210 ft and mainly faces SSE. Its nearly flat slopes can hold water in flat stretches.

How we check ourselves

How these factors affect drying

SoilOrganic soil

The soil survey describes organic material at this spot, not a mineral soil texture. The drying model uses surveyed water-retention values. Organic soils vary in how they drain, so this label alone does not tell you how quickly the trail will dry.

CanopyDense 71%

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

TerrainHolds water

Water tends to pool and linger here rather than running off, so the surface can stay damp well after the weather clears.

FAQ

Can you ride Millersylvania State Park right now?

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

Is Millersylvania State Park muddy right now?

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

What is the soil and trail surface like at Millersylvania State Park?

Millersylvania State Park has organic soil. The soil survey describes organic material at this spot, not a mineral soil texture. The drying model uses surveyed water-retention values. Organic soils vary in how they drain, so this label alone does not tell you how quickly the trail will dry.

How long does Millersylvania State Park take to dry after rain?

Millersylvania State Park has organic soil with no fixed drying time; check the live verdict for the current estimate. Its terrain holds water in low spots, which slows it. Heavy tree cover slows drying further.

Can you ride Millersylvania State Park after rain?

Wait until the surface is firm and respect any posted closures. Organic soil alone does not tell you how soon that will be. Check the live verdict for the current drying estimate.

Does Millersylvania State Park get snow in winter?

Yes. At 210 ft, Millersylvania State Park 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 Millersylvania State Park?

Millersylvania State Park sits at roughly 210 feet, faces mostly SSE, and averages a 1.5° grade with about 71% tree cover. It is quicker to dry where it faces south, and the nearly flat terrain holds puddles in the flats.

When is the best time of year to ride Millersylvania State Park?

Snow can limit riding at Millersylvania State Park in winter, at around 210 feet. Spring snowmelt and fall freezes can also affect conditions. Its sunny aspect helps it come back fast after storms. Check the current conditions before planning a ride.

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Network profile

Network profile

Soil
Organic soilsurveyed retention
Drainage
Holds waterdries slowly
Tree cover
71%Dense
Elevation
210 ft
Average grade
1.5°
Predominant aspect
SSE-facing

Around Millersylvania State Park

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