Loam
Tree cover slows drying
Dense trees block sunlight and reduce airflow near the ground. A cool, shaded trail can hold moisture longer than nearby open ground with similar soil and drainage.
Shade alone does not tell you whether a trail is rideable. Steep or rocky sections may still drain well under trees.
Sun dries the surface first
Direct sunlight warms the ground and helps water evaporate. But a dry-looking surface can still have soft soil underneath, especially after heavy rain or a wet week.
Check firmness as well as appearance. Low spots may stay soft even when the sunny sections look ready.
Wind helps water evaporate
Moving air carries moisture away from the surface. Exposed trails often dry faster than sheltered ones, particularly in warm weather.
A breeze will not quickly dry saturated soil or a puddle with nowhere to drain.
Look at shade and drainage together
Open and sloped
Sun, airflow, and drainage can all help the surface dry.
Open and flat
The trail gets sun, but water may still collect in low spots.
Shaded and sloped
The slope helps water drain, while shade slows evaporation.
Shaded and flat
Limited sun and slow drainage can leave the ground wet for longer.
Shade is one part of the comparison
Tree cover changes light and airflow near the ground, but it does not decide rideability by itself. Soil, slope, drainage, recent rain, and temperature can outweigh the difference between an open and shaded section.
Loam's grade and shade report uses analysis categories to compare sampled terrain. Its shaded and steep, shaded and mellow, open and steep, and open and mellow groups describe slope and canopy inputs. They are not trail difficulty ratings or current surface observations.
Compare exposure in a riding region
Bend spans open high desert, shaded forest and higher volcanic terrain. Compare current Bend-area network conditions before choosing between those settings. Tree cover and elevation describe the setting, not the firmness of every trail.
Shorter autumn days add another reason to check locally. The New England and Midwest fall riding guide connects seasonal weather with local access and freeze-thaw decisions.
Before you ride
Check official closures and current conditions. When you arrive, look at the sections that dry last. If your tires sink or leave ruts, turn back.
Sources and method
Loam estimates conditions from weather, soil, and terrain. It does not measure the trail surface directly or override an official closure. Read how the estimate works and see the published checks and their limits.
- USGS: Infiltration and the Water Cycle, saturation, land cover, and slope.
- USGS: Soil-Water-Balance, moisture, evaporation, and canopy interception.
These references explain physical processes, not the accuracy of Loam's predictions.
