When should you worry if someone is late back from mountain biking?
Mountain bike rides run late for ordinary reasons: a broken derailleur, a flat far from the car, a long hike-a-bike. Give about 45 minutes of slack on a trail-center ride. Worry sooner if their location stopped on a descent or technical section and they won't answer, since crashes there can mean a head or collarbone injury. If they're well past due, not answering, and it's getting dark, call 911 with the trail name and last known location.
Working out whether a late rider needs help
01Know the trail system they're riding
Trail networks are a maze of named loops and connectors. Ask the rider to tell you the trailhead and which trails they plan to ride. When you report someone overdue, "the black loop off the north lot" is far more useful to searchers than "somewhere in the forest."
02Look at where the dot stopped
Check how long ago the last update came in, then where the dot sits. A stop at the parking lot means they're probably loading the bike. A stop at a junction may be a snack break. A stop partway down a descent or in a rock garden, still updating but not moving for 15 minutes, with no reply, looks like a crash or a serious mechanical. If the location is marked stale instead, signal in wooded valleys is often patchy; follow the route line to see which trail they were on and compare with the trail map before assuming the worst.
03Call, then call the people who ride there
Call the rider twice. If they don't answer, a local riding partner, bike shop or trail club may know who is out and whether the car is still in the lot.
04Call 911 with details searchers can use
Give the rider's name and age, the trailhead and trail names, the last known location and the time it was recorded, the bike color and their clothing and helmet, any medical conditions, and whether they ride alone. Say that they may be injured on steep ground where a vehicle can't reach, so the dispatcher can send a team that can carry someone out. The guide on when to call 911 if someone is overdue covers the rest of the call.
05If you find them, protect the neck
A rider who went over the bars may have a head, neck or back injury. St John Ambulance advises not moving a person with a suspected spinal injury, and not telling them to move, unless they are in immediate danger, and steadying the head in line with the body. Leave the helmet on, call 911 first, keep them warm and talk to them.
Related questions
The rider has done this trail a hundred times. Should I still act?
Yes, if the signs are there. Familiar trails are where riders push hardest, and crashes happen at speed. If they stopped mid-descent and won't answer, a quick call to check is sensible, not overcautious.
Can their phone tell me they crashed?
Some can try. Holler's crash detection is an opt-in beta that looks for a hard impact followed by stillness, then asks the rider "Are you OK?" and alerts you if they don't answer. Mountain biking is full of hard landings, so it can false-alarm, and it can also miss a real crash. Treat it as a helpful extra, not a replacement for a return time.
What should I have on hand during their ride?
The trailhead and trail names, the bike and clothing colors, their car, and a rough return time. Keep your phone on loud. If they set a return time, Holler sends you an overdue alert five minutes after it passes without a check-in. Our guide on being a good safety contact explains how to stay calm and useful while you wait.
Go deeper
More questions about this activity
The same question for other activities
Compare your options
Sources, checked September 2026: St John Ambulance: Spinal injury first aid.
More safety answers, or see the safety guides.