SE Michigan Mountain Biking
Data from Open-Meteo, NWS & NOAA MRMS radar · Updates every 30 min · SE Michigan MTB
Model-based estimate — trust, but use your eyes at the trailhead
Weather-based trail condition predictions for mountain bikers in SE Michigan. Every trail is assessed against current weather data — recent rain, temperature, and the forecast ahead — so you can decide whether it's worth the drive before you leave the house.
Conditions update every 30 minutes. If a trail has a known closure or special situation, the local coordinator can post a manual override that takes precedence over the weather model.
Most weather apps tell you there's a 90% chance of rain — but not whether that's 0.05" or an inch. RainSense™ always shows the actual amount in inches. Colour encodes probability: light blue means unlikely, dark blue means near-certain.
A 90% chance of 0.05" is a dark blue near-nothing — annoying but not trip-cancelling. A 25% chance of 0.8" is a light blue tall bar — low odds, but worth watching.
From late fall through spring, frozen ground — not rain — drives conditions. The model tracks ground temperature below the surface and adds these cues:
Why the spring thaw matters: after weeks of deep frost the ground thaws from the top down. Melting snow and rain sit trapped above the still-frozen layer, so trails stay saturated for weeks — even through a sunny, dry stretch. It's the same reason Michigan puts weight restrictions on roads every spring. Trails typically need about a week of warm ground (and the snow gone) before they firm up; the model waits for exactly that.
Weather data comes from three sources: Open-Meteo for forecasts and baseline rainfall, NWS airport station observations for timing, and NOAA MRMS radar data (via Iowa Environmental Mesonet) for accurate rain amounts — particularly for localised summer storms that gridded models and airport stations can miss. When radar data corrects the rain figure, a note appears on the trail's detail page.
Drying models are tuned to each trail's soil type and drainage. Official NWS weather alerts for SE Michigan are shown automatically when active.
Rate the conditions after you ride. Each trail's Today page has a quick Drier / About right / Wetter button at the bottom. Takes one tap — those reports directly improve how the drying model is tuned for that trail.
Request a feature or report an issue. New trail, something looks wrong, anything — I'd love to hear it.
I'm Jon Barks, aka Woof. I'm an avid mountain biker with a fascination with weather. I'd constantly check weather apps and social media reports to plan when to ride — trying to figure out if a trail was actually rideable without causing damage.
This site is a combination of those two passions: a decision tool that brings everything into one place. No ads, no accounts, no tracking.
Questions or corrections? Drop me a note →
If this site saves you a wasted drive or helps you catch a perfect window, consider buying me a coffee — it keeps the servers running and the model improving.
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SE Michigan MTB Trail Conditions