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Harriman State Park

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

PRIME: Rideable now

No significant rain in the forecast.

Recent rain
0.7″ of rain, 2d ago
Today
61°Fcloudy
  • 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 then DUSTY
  • Sun 9/13, no measurable rain, modeled conditions: DUSTY then PRIME
  • Mon 9/14, no measurable rain, modeled conditions: PRIME
  • Tue 9/15, no measurable rain, modeled conditions: PRIME
  • Wed 9/16, no measurable rain, modeled conditions: PRIME then DUSTY
  • Thu 9/17, 0.23 inches of rain, modeled conditions: DUSTY then PRIME then CAUTION
  • Fri 9/18, 0.55 inches of rain, modeled conditions: CAUTION then STAY OFF then CAUTION then PRIME then CAUTION then 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, no measurable rain, modeled conditions: PRIME, forecast preview, beyond the free window
  • Fri 9/25, no measurable rain, modeled conditions: PRIME, forecast preview, beyond the free window

Updated Sep 20, 2026, 12:43 UTC. Modeled hourly. Verdict last changed: Sep 18. Official closures and current trail conditions take priority.

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Is Harriman State Park rideable today?

Yes. The live verdict is PRIME, rideable now. 0.7″ of rain, 2d ago.

CHANGED
Fri 189pm
Dried back to PRIME.
Fri 187pm
Rain moved in. Verdict dropped to CAUTION.
Fri 185pm
Dried back to PRIME.
Over the tracked history, Harriman State Park has been rideable on 10 of the last 10 days (very dry and dusty on 3 of them). 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. The soil here is organic. With little tree cover, the ground gets plenty of sun and wind. The terrain averages a 0.6° slope at 6,142 ft and mainly faces NE. Its nearly flat slopes can hold water in flat stretches.

How we check ourselves

How these factors affect drying

SoilOrganic soil

The soil survey describes organic material at this spot, not a mineral soil texture. The drying model uses surveyed water-retention values. Organic soils vary in how they drain, so this label alone does not tell you how quickly the trail will dry.

CanopyOpen 24%

Little tree cover means full sun and wind, so these trails are among the fastest to rebound after rain.

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 Harriman State Park right now?

The current estimate for Harriman State Park is PRIME: rideable now. No significant rain in the forecast. 0.7″ of rain, 2d ago.

Is Harriman State Park muddy right now?

Loam currently estimates dry conditions (PRIME). 0.7″ of rain, 2d ago.

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

Harriman State Park has organic soil. The soil survey describes organic material at this spot, not a mineral soil texture. The drying model uses surveyed water-retention values. Organic soils vary in how they drain, so this label alone does not tell you how quickly the trail will dry.

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

Harriman State Park has organic soil with no fixed drying time; check the live verdict for the current estimate. Its terrain holds water in low spots, which slows it.

Can you ride Harriman State Park after rain?

Wait until the surface is firm and respect any posted closures. Organic soil alone does not tell you how soon that will be. Check the live verdict for the current drying estimate.

Does Harriman State Park get snow in winter?

Yes. At 6,142 ft, Harriman State Park 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 Harriman State Park?

Harriman State Park sits at roughly 6,142 feet, faces mostly NE, and averages a 0.6° grade with about 24% tree cover. It is exposed to morning sun, and the nearly flat terrain holds puddles in the flats.

When is the best time of year to ride Harriman State Park?

Snow can limit riding at Harriman State Park in winter, at around 6,142 feet. Spring snowmelt and fall freezes can also affect conditions. Check the current conditions before planning a ride.

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Network profile

Network profile

Soil
Organic soilsurveyed retention
Drainage
Holds waterdries slowly
Tree cover
24%Open
Elevation
6,142 ft
Average grade
0.6°
Predominant aspect
NE-facing

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