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Mount Diablo

Mountain bike trail conditions · Bay Area, CA 37.883° N  121.910° W   3,140 FT Verified

DUSTY: Rideable, very dry

Mon 12am Conditions turn Prime.

Recent rain
No measurable rain in the past week
Today
71°Fcloudy
  • Thu 9/10, no measurable rain, modeled conditions: DUSTY
  • Fri 9/11, no measurable rain, modeled conditions: DUSTY
  • Sat 9/12, no measurable rain, modeled conditions: DUSTY
  • Sun 9/13, no measurable rain, modeled conditions: DUSTY
  • Mon 9/14, no measurable rain, modeled conditions: DUSTY
  • Tue 9/15, no measurable rain, modeled conditions: DUSTY
  • Wed 9/16, no measurable rain, modeled conditions: DUSTY
  • Thu 9/17, no measurable rain, modeled conditions: DUSTY
  • Fri 9/18, no measurable rain, modeled conditions: DUSTY
  • Sat 9/19, no measurable rain, modeled conditions: DUSTY
  • Today, Sun 9/20, no measurable rain, modeled conditions: DUSTY then 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 then DUSTY
  • Thu 9/24, no measurable rain, modeled conditions: DUSTY, forecast preview, beyond the free window
  • Fri 9/25, no measurable rain, modeled conditions: DUSTY, 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 Mount Diablo rideable today?

Yes. The live verdict is DUSTY: rideable, but very dry and loose over hardpack. No measurable rain in the past week.

Over the tracked history, Mount Diablo has been rideable on 10 of the last 10 days (very dry and dusty on 10 of them). Loam also considers soil, slope, tree cover, and drying time.

Soil and terrain at Mount Diablo

Mount Diablo is a mountain bike trail network in Bay Area, CA. The soil is loam and drains well. The terrain averages a 15.5° slope at 3,140 ft and mainly faces E. Its steep slopes shed water quickly after rain. Trails here include Summit Trail, Prospector's Gap Road and Peak Trail.

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. The soil type here is classified, but the exact drying speed is modeled from that classification rather than measured directly at this spot.

CanopyPartial 36%

A mix of sun and shade. Conditions vary across the network, with open sections drying faster than covered ones.

TerrainSheds water

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

FAQ

Can you ride Mount Diablo right now?

The current estimate for Mount Diablo is DUSTY: rideable, very dry. Rideable, but very dry. Expect dust and loose corners. No measurable rain in the past week.

Is Mount Diablo muddy right now?

Loam currently estimates dry conditions (DUSTY). No measurable rain in the past week.

What is the soil and trail surface like at Mount Diablo?

Mount Diablo 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. The soil type here is classified, but the exact drying speed is modeled from that classification rather than measured directly at this spot.

How long does Mount Diablo take to dry after rain?

Mount Diablo usually needs about a day or two to dry after meaningful rain. Its terrain sheds water, which speeds drying.

Can you ride Mount Diablo 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 Mount Diablo get snow in winter?

Rarely. Mount Diablo sits low and mild enough (around 3,140 ft) that snow seldom affects riding; conditions are driven by rain and drying. Loam still flags FROZEN on the rare freeze.

What trails are at Mount Diablo?

Trails at Mount Diablo include Summit Trail, Prospector's Gap Road, Peak Trail, Meridian Ridge Road and Green Ranch Road. This is a partial list. The condition estimate covers the whole network, so individual trails may differ.

What's the terrain and elevation like at Mount Diablo?

Mount Diablo sits at roughly 3,140 feet, faces mostly E, and averages a 15.5° grade with about 36% tree cover. It is exposed to morning sun, and the steep terrain sheds water quickly.

When is the best time of year to ride Mount Diablo?

Snow rarely affects Mount Diablo. Check recent rain and allow time for the ground to dry. The live verdict above reflects today.

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Network profile

Network profile

Soil
Loamdrains well · modeled
Drainage
Sheds waterdries quickly
Tree cover
36%Partial
Elevation
3,140 ft
Average grade
15.5°
Predominant aspect
E-facing

Named trails

  • Summit Trail
  • Prospector's Gap Road
  • Peak Trail
  • Meridian Ridge Road
  • Green Ranch Road

This is a partial trail list. The condition estimate covers the whole network. Trail names from public agency data and © OpenStreetMap contributors.

Around Mount Diablo

Nearby networks

Shell Ridge7 MI Las Trampas11 MI Briones12 MI Brushy Peak14 MI Redwood Regional Park14 MI

Every Bay Area network →

Trail stewards

Trail work here is done by Mount Diablo Interpretive Association. Support your local builders.