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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

Thursday, October 22nd Conditions turn Caution.

Recent rain
No measurable rain in the past week
Today
79°Fclear
  • Wed 10/7, no measurable rain, daily high 85 degrees Fahrenheit, modeled conditions: DUSTY
  • Thu 10/8, no measurable rain, daily high 86 degrees Fahrenheit, modeled conditions: DUSTY
  • Fri 10/9, no measurable rain, daily high 79 degrees Fahrenheit, modeled conditions: DUSTY
  • Sat 10/10, no measurable rain, daily high 59 degrees Fahrenheit, modeled conditions: DUSTY
  • Sun 10/11, no measurable rain, daily high 58 degrees Fahrenheit, modeled conditions: DUSTY
  • Mon 10/12, no measurable rain, daily high 58 degrees Fahrenheit, modeled conditions: DUSTY
  • Tue 10/13, no measurable rain, daily high 62 degrees Fahrenheit, modeled conditions: DUSTY
  • Wed 10/14, no measurable rain, daily high 69 degrees Fahrenheit, modeled conditions: DUSTY
  • Thu 10/15, no measurable rain, daily high 74 degrees Fahrenheit, modeled conditions: DUSTY
  • Fri 10/16, no measurable rain, daily high 80 degrees Fahrenheit, modeled conditions: DUSTY
  • Today, Sat 10/17, no measurable rain, daily high 79 degrees Fahrenheit, modeled conditions: DUSTY
  • Sun 10/18, no measurable rain, daily high 71 degrees Fahrenheit, modeled conditions: DUSTY
  • Mon 10/19, no measurable rain, daily high 61 degrees Fahrenheit, modeled conditions: DUSTY
  • Tue 10/20, no measurable rain, daily high 60 degrees Fahrenheit, modeled conditions: DUSTY
  • Wed 10/21, 0.17 inches of rain, daily high 60 degrees Fahrenheit, modeled conditions: DUSTY, forecast preview, beyond the free window
  • Thu 10/22, 0.16 inches of rain, daily high 54 degrees Fahrenheit, modeled conditions: CAUTION then STAY OFF then CAUTION then DRY, forecast preview, beyond the free window
Updated

Updated Saturday, October 17th, 2026 at 18:56 UTC. Official closures and current trail conditions take priority.

Modeled hourly. Closures and local 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. Soil data at the sampled location is classified as loam. Terrain data indicates an elevation of about 3,140 ft, an average terrain slope of 15.5° and a predominant E-facing aspect. Terrain slope does not measure the trail tread or its drainage features. Trails here include Prospector's Gap Road, North Peak Trail and Meridian Ridge Road. Loam models conditions across the network; individual trails and constructed surfaces can differ from these environmental inputs. Official closures and conditions on the ground take priority.

How we check ourselves

How these factors affect drying

SoilLoam

Loam combines drainage with water retention. Soil type alone does not establish how long this network takes to dry. Drying behavior is modeled from the soil classification, not measured directly on the trail.

CanopyPartial 36%

Partial tree cover suggests a mix of sun and shade. Local exposure and surface conditions can vary across the network.

TerrainSteep

Steeper terrain can encourage runoff. Terrain slope does not measure the trail tread or its drainage features.

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?

The soil data at the sampled location is classified as loam. This describes an environmental input, not a survey of every trail surface.

How long does Mount Diablo take to dry after rain?

Mount Diablo has no fixed drying time. Rainfall, soil moisture, shade and the weather that follows all matter. Check the current estimate and wait until the trail surface is firm.

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.

What does a frozen condition mean at Mount Diablo?

FROZEN means Loam estimates snow cover or frozen ground. It does not establish that riding is allowed or that every trail is frozen. Check posted winter access rules and watch for soft ground as temperatures rise.

What trails are at Mount Diablo?

Trails at Mount Diablo include Prospector's Gap Road, North Peak Trail, Meridian Ridge Road, Green Ranch Road and Rhine Canyon 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?

Terrain data indicates an elevation of about 3,140 ft, an average terrain slope of 15.5° and a predominant E-facing aspect. Terrain slope does not measure the trail tread or its drainage features.

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Network profile

Network profile

Soil
Loamdrainage input · modeled
Terrain
Steepterrain slope
Tree cover
36%Partial
Elevation
3,140 ft
Average grade
15.5°
Predominant aspect
E-facing

Named trails

  • Prospector's Gap Road
  • North Peak Trail
  • Meridian Ridge Road
  • Green Ranch Road
  • Rhine Canyon 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.