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Sunol Regional Wilderness

Mountain bike trail conditions · Bay Area, CA 37.536° N  121.832° W   1,089 FT Verified

CAUTION: Use judgment

Thursday, October 22nd at 3pm Dries back to Dry.

Recent rain
No measurable rain in the past week
Today
58°Flight rain
  • Mon 10/12, no measurable rain, daily high 66 degrees Fahrenheit, modeled conditions: DUSTY
  • Tue 10/13, no measurable rain, daily high 73 degrees Fahrenheit, modeled conditions: DUSTY
  • Wed 10/14, no measurable rain, daily high 78 degrees Fahrenheit, modeled conditions: DUSTY
  • Thu 10/15, no measurable rain, daily high 82 degrees Fahrenheit, modeled conditions: DUSTY
  • Fri 10/16, no measurable rain, daily high 90 degrees Fahrenheit, modeled conditions: DUSTY
  • Sat 10/17, no measurable rain, daily high 90 degrees Fahrenheit, modeled conditions: DUSTY
  • Sun 10/18, no measurable rain, daily high 78 degrees Fahrenheit, modeled conditions: DUSTY
  • Mon 10/19, no measurable rain, daily high 64 degrees Fahrenheit, modeled conditions: DUSTY
  • Tue 10/20, no measurable rain, daily high 68 degrees Fahrenheit, modeled conditions: DUSTY
  • Wed 10/21, no measurable rain, daily high 65 degrees Fahrenheit, modeled conditions: DUSTY then DRY
  • Today, Thu 10/22, 0.17 inches of rain, daily high 58 degrees Fahrenheit, modeled conditions: DRY then CAUTION then DRY
  • Fri 10/23, no measurable rain, daily high 61 degrees Fahrenheit, modeled conditions: DRY
  • Sat 10/24, no measurable rain, daily high 72 degrees Fahrenheit, modeled conditions: DRY
  • Sun 10/25, no measurable rain, daily high 74 degrees Fahrenheit, modeled conditions: DRY
  • Mon 10/26, no measurable rain, daily high 73 degrees Fahrenheit, modeled conditions: DRY, forecast preview, beyond the free window
  • Tue 10/27, no measurable rain, daily high 68 degrees Fahrenheit, modeled conditions: DRY, forecast preview, beyond the free window
Updated

Updated Thursday, October 22nd, 2026 at 20:36 UTC. Verdict last changed: Thursday, October 22nd. Official closures and current trail conditions take priority.

Modeled hourly. Closures and local conditions take priority.

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Is Sunol Regional Wilderness rideable today?

Rideable with judgment. The live verdict is CAUTION: the model reads the surface as marginal. No measurable rain in the past week.

CHANGED
Wednesday, October 21st at 10pm
Rain moved in. Verdict dropped to DRY.
Over the tracked history, Sunol Regional Wilderness has been rideable on 9 of the last 10 days (very dry and dusty on 9 of them), and under a caution advisory on 1. Loam also considers soil, slope, tree cover, and drying time.

Soil and terrain at Sunol Regional Wilderness

Sunol Regional Wilderness 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 1,089 ft, an average terrain slope of 10° and a predominant W-facing aspect. Terrain slope does not measure the trail tread or its drainage features. Trails here include Maguire Peak Trail, Flag Hill Loop Trail and Welch - Flag Hill Trail. 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. The model uses surveyed water-retention values, not measured trail recovery times.

CanopyPartial 28%

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 Sunol Regional Wilderness right now?

The current estimate for Sunol Regional Wilderness is CAUTION: use judgment. Recent rain not yet modeled. Local radar saw rain the forecast missed. Conditions may be wetter than shown. No measurable rain in the past week.

Is Sunol Regional Wilderness muddy right now?

Possibly in places. The current estimate is CAUTION. Watch for soft sections, especially in low or shaded areas. No measurable rain in the past week.

What is the soil and trail surface like at Sunol Regional Wilderness?

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 Sunol Regional Wilderness take to dry after rain?

Sunol Regional Wilderness 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 Sunol Regional Wilderness 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 Sunol Regional Wilderness?

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 Sunol Regional Wilderness?

Trails at Sunol Regional Wilderness include Maguire Peak Trail, Flag Hill Loop Trail, Welch - Flag Hill Trail, Vista Grande Road and Cave Rocks 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 Sunol Regional Wilderness?

Terrain data indicates an elevation of about 1,089 ft, an average terrain slope of 10° and a predominant W-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
Terrain
Steepterrain slope
Tree cover
28%Partial
Elevation
1,089 ft
Average grade
10°
Predominant aspect
W-facing

Named trails

  • Maguire Peak Trail
  • Flag Hill Loop Trail
  • Welch - Flag Hill Trail
  • Vista Grande Road
  • Cave Rocks Road

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

Around Sunol Regional Wilderness

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