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Black Diamond Open Space

Mountain bike trail conditions · Seattle & Snoqualmie, WA 47.348° N  122.011° W   627 FT Verified

PRIME: Rideable now

Thu 24 Conditions turn Caution.

Recent rain
0.7″ 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, no measurable rain, modeled conditions: PRIME
  • Sun 9/13, 0.74 inches of rain, modeled conditions: PRIME then CAUTION then STAY OFF
  • Mon 9/14, no measurable rain, modeled conditions: STAY OFF then CAUTION then 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, forecast preview, beyond the free window
  • Fri 9/25, 0.12 inches of rain, modeled conditions: CAUTION, forecast preview, beyond the free window

Updated Sep 20, 2026, 13:53 UTC. Modeled hourly. Verdict last changed: Sep 14. Official closures and current trail conditions take priority.

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Is Black Diamond Open Space rideable today?

Yes. The live verdict is PRIME, rideable now. 0.7″ of rain, 7d ago.

CHANGED
Mon 145pm
Dried back to PRIME.
Mon 1411am
Dried back to CAUTION.
Sun 133pm
Rain moved in. Verdict dropped to STAY OFF.
Over the tracked history, Black Diamond Open Space has been rideable on 9 of the last 10 days, and too wet to ride on 1. Loam also considers soil, slope, tree cover, and drying time.

Soil and terrain at Black Diamond Open Space

Black Diamond Open Space is a mountain bike trail network in Seattle & Snoqualmie, WA. The soil is gravelly loam and drains fast. Heavy tree cover can slow drying after rain. The terrain averages a 2.1° slope at 627 ft and mainly faces SSE. Its gentle slopes drain slowly, so low spots can stay soft after rain.

How we check ourselves

How these factors affect drying

SoilGravelly loam

About 20% of this ground is rock fragments, so water runs through it faster than the soil type alone suggests. It dries quicker than plain loam.

CanopyDense 75%

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 Black Diamond Open Space right now?

The current estimate for Black Diamond Open Space is PRIME: rideable now. No significant rain in the forecast. 0.7″ of rain, 7d ago.

Is Black Diamond Open Space muddy right now?

Loam currently estimates dry conditions (PRIME). 0.7″ of rain, 7d ago.

What is the soil and trail surface like at Black Diamond Open Space?

Black Diamond Open Space sits on gravelly loam soil that drains fast. About 20% of this ground is rock fragments, so water runs through it faster than the soil type alone suggests. It dries quicker than plain loam.

How long does Black Diamond Open Space take to dry after rain?

Black Diamond Open Space usually needs about a day or two to dry after meaningful rain. Its terrain holds water in low spots, which slows it. Heavy tree cover slows drying further.

Can you ride Black Diamond Open Space 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 Black Diamond Open Space get snow in winter?

Yes. At 627 ft, Black Diamond Open Space 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 Black Diamond Open Space?

Black Diamond Open Space sits at roughly 627 feet, faces mostly SSE, and averages a 2.1° grade with about 75% tree cover. It is quicker to dry where it faces south, and the gentle terrain leaves low spots soft after storms.

When is the best time of year to ride Black Diamond Open Space?

Snow can limit riding at Black Diamond Open Space in winter, at around 627 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
Gravelly loamdrains fast
Drainage
Holds waterdries slowly
Tree cover
75%Dense
Elevation
627 ft
Average grade
2.1°
Predominant aspect
SSE-facing

Around Black Diamond Open Space

Nearby networks

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Every Seattle & Snoqualmie network →

Trail stewards

Trail work here is done by Evergreen Mountain Bike Alliance. Support your local builders.