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Harriman State Park

Mountain bike trail conditions · Idaho 44.331° N  111.462° W   6,142 FT Verified

DRY: Rideable

No significant rain in the forecast.

Recent rain
0.4″ of rain, 4d ago
Today
44°Ffog or low cloud
  • Mon 10/26, no measurable rain, daily high 50 degrees Fahrenheit, modeled conditions: DRY
  • Tue 10/27, no measurable rain, daily high 37 degrees Fahrenheit, modeled conditions: DRY
  • Wed 10/28, no measurable rain, daily high 39 degrees Fahrenheit, modeled conditions: DRY
  • Thu 10/29, no measurable rain, daily high 48 degrees Fahrenheit, modeled conditions: DRY
  • Fri 10/30, 0.24 inches of rain, daily high 52 degrees Fahrenheit, modeled conditions: DRY then CAUTION then STAY OFF
  • Sat 10/31, 0.13 inches of rain, daily high 47 degrees Fahrenheit, modeled conditions: CAUTION then DRY then CAUTION then DRY
  • Sun 11/1, 0.56 inches of rain, daily high 42 degrees Fahrenheit, modeled conditions: DRY then CAUTION then STAY OFF then CAUTION then DRY
  • Mon 11/2, no measurable rain, daily high 42 degrees Fahrenheit, modeled conditions: DRY
  • Tue 11/3, no measurable rain, daily high 45 degrees Fahrenheit, modeled conditions: DRY
  • Wed 11/4, no measurable rain, daily high 50 degrees Fahrenheit, modeled conditions: DRY
  • Today, Thu 11/5, no measurable rain, daily high 44 degrees Fahrenheit, modeled conditions: DRY
  • Fri 11/6, no measurable rain, daily high 41 degrees Fahrenheit, modeled conditions: DRY
  • Sat 11/7, no measurable rain, daily high 48 degrees Fahrenheit, modeled conditions: DRY
  • Sun 11/8, no measurable rain, daily high 49 degrees Fahrenheit, modeled conditions: DRY
  • Mon 11/9, no measurable rain, daily high 51 degrees Fahrenheit, modeled conditions: DRY, forecast preview, beyond the free window
  • Tue 11/10, no measurable rain, daily high 51 degrees Fahrenheit, modeled conditions: DRY, forecast preview, beyond the free window
Updated

Updated Thursday, November 5th, 2026 at 12:47 UTC. Verdict last changed: Thursday, November 5th. Official closures and current trail conditions take priority.

Modeled hourly. Closures and local conditions take priority.

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Is Harriman State Park rideable today?

Yes. The live verdict is DRY, rideable now. 0.4″ of rain, 4d ago.

CHANGED
Sunday, November 1st at 9am
Dried back to CAUTION.
Sunday, November 1st at 5am
Rain moved in. Verdict dropped to STAY OFF.
Saturday, October 31st at 12am
Dried back to CAUTION.
Over the tracked history, Harriman State Park has been rideable on 9 of the last 10 days, and under a caution advisory on 1. Loam also considers soil, slope, tree cover, and drying time.

Soil and terrain at Harriman State Park

Harriman State Park is a mountain bike trail network in Idaho. Soil data at the sampled location is classified as gravelly loam. Open tree cover can allow more sun and wind exposure, helping drying. Terrain data indicates an elevation of about 6,142 ft, an average terrain slope of 0.6° and a predominant NE-facing aspect. Terrain slope does not measure the trail tread or its drainage features. 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

SoilGravelly loam

The soil data includes about 20% rock fragments. The model uses this to adjust drainage; it does not measure how quickly every trail section dries. The model uses surveyed water-retention values, not measured trail recovery times.

CanopyOpen 24%

Open tree cover can allow more sunlight and wind to reach the ground. Terrain, weather and trail construction also affect drying.

TerrainGentle

Gentle terrain can allow water to linger, but slope alone does not establish whether water pools on a trail.

FAQ

Can you ride Harriman State Park right now?

The current estimate for Harriman State Park is DRY: rideable. Rideable now. No significant rain in the forecast. 0.4″ of rain, 4d ago.

Is Harriman State Park muddy right now?

Loam currently estimates dry conditions (DRY). 0.4″ of rain, 4d ago.

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

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

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

Harriman State Park 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 Harriman State Park 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 Harriman State Park?

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's the terrain and elevation like at Harriman State Park?

Terrain data indicates an elevation of about 6,142 ft, an average terrain slope of 0.6° and a predominant NE-facing aspect. Terrain slope does not measure the trail tread or its drainage features.

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Network profile

Network profile

Soil
Gravelly loamdrainage input
Terrain
Gentleterrain slope
Tree cover
24%Open
Elevation
6,142 ft
Average grade
0.6°
Predominant aspect
NE-facing

Around Harriman State Park

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