Safety for ultrarunners training alone
A safety app for ultrarunners is useful on the parts of a long solo day that have signal: it shows your people where you are, sends an overdue alert if you do not finish on time, and asks "Are you OK?" if you stop moving. It cannot reach anyone from a dead zone, so remote training days also need a written plan, a margin of gear, and sometimes a satellite device.
Solo training days are the unsupported part of the sport
Race day has aid stations, sweeps, medics and a course marked with flags. The solo training days that get you there often have none of that. A 30-mile Saturday on trails can mean seven or eight hours alone, long climbs between road crossings, water you have to filter or carry, and a finish after dark if the day goes long.
The risks are cumulative. Hours of effort bring fatigue, and fatigue brings the classic ultra mistakes: a missed junction, a stumble on a descent you would dance through fresh, a stomach that stops taking calories, or a decision to push on when turning back was the better call. Weather also has more time to change on you than it does on a two-hour run.
Where a phone helps and where it doesn't
On a long trail day your phone will likely move in and out of coverage. While it has signal, a live link lets your Guardian see progress and gives them a real trail position if something goes wrong. When it loses signal, updates pause and your Guardian keeps your last known location. That is still valuable. It is not the same as a way to call for help.
If your training routes spend hours in canyons or high country with no coverage, carry a dedicated satellite messenger or use a phone with satellite emergency features where they are supported. Holler does not replace a satellite device; it works over cell data. Our comparison of a satellite messenger vs a phone safety app is honest about which fits which day, and how to stay safe ultrarunning with no cell service covers the dead-zone plan.
| Route | What the live link does | Add | Your Guardian should expect |
|---|---|---|---|
| Road or rail-trail long run with steady signal | Near-continuous position and route | Return time, stationary alert | Regular updates; act on SOS, stationary or overdue alerts |
| Trail loop with patchy coverage | Updates on ridges and near roads, gaps in valleys | Written plan, return time, turnaround time | Gaps of 30 to 60 minutes; the last known location is the starting point if you are overdue |
| Canyon or high-country route with little or no coverage | Mostly frozen at the last point with signal | Satellite messenger or phone satellite emergency features, plus the written plan | Almost nothing live; the overdue alert and the plan are what they act on. See what to do if you get lost while ultrarunning |
A long-day setup
Set a turnaround time as well as a return time. The turnaround is your promise to yourself that you will start back at a certain hour no matter where you are. It is the single best defense against the finish drifting into darkness.
01Write the plan down and send it
Trailhead, route, bail-out points, the time you expect to finish, the time you would be worried, and the land agency or county for the area. The outing plan tool formats it for you.
02Set a return time for the finish, with a real margin
Ultra days swing by hours, so be generous: your realistic finish plus the drive back into signal plus a buffer for a bad patch. If you have not checked in five minutes after it, Holler's server sends your Guardians an overdue alert, even when your phone is off or out of range.
03Set the stationary alert long
You will stop to filter water, fix a blister or eat. Pick a threshold longer than any planned stop. If you stop for longer, Holler asks "Are you OK?" and alerts your Guardians if you do not answer, as long as your phone can reach the network.
04Protect the battery
Live sharing uses power, and the phone may also be your map. Start at full charge, carry a small power bank, and keep the phone warm in cold weather. See how much battery live location sharing uses.
05Carry for a night you didn't plan
A headlamp with fresh batteries, a warm layer, a foil blanket, extra food and water treatment. The NPS Ten Essentials list is a good checklist for long trail days, even in running form.
Fatigue, heat and your own judgment
Late in a long day, the person making decisions is tired and possibly under-fueled. Agree some rules with yourself before you start: if you are not eating, you slow down; if you miss a junction, you go back to the last known point rather than bushwhacking; if you feel confused on a hot day, you stop in shade and treat it as an emergency. The National Weather Service lists confusion, dizziness and fainting among heat stroke warning signs and says to call 911 or get the person to a hospital immediately. More on the heat side in staying safe ultrarunning in the heat.
Holler cannot sense heat illness, dehydration or a heart problem. It notices stillness and missed return times, and that only helps if the right person is on the other end.
A 30-mile solo Saturday, planned out
Say you are running a 30-mile trail loop with 5,000 feet of climbing in September. Your recent pace on similar terrain is around 15 minutes per mile including hiking the climbs, so moving time is about 7.5 hours. Add an hour for filtering, eating and a blister, and the day is 8.5 hours.
You start at 6:00 a.m. and expect to finish at 2:30 p.m. Sunset is around 7 p.m., which you checked with the daylight calculator. Your turnaround time is 11:00 at the fire road crossing at mile 16: if you are not there by then, you take the fire road out instead of finishing the loop. You will be back in signal on the drive by 3:00, so the return time is 4:30. That 90-minute margin covers a bad patch without leaving someone hurt on the trail into the night.
Stationary alert: 25 minutes, longer than the planned filter stop at the creek. The written plan lists the trailhead, the fire road bail-out, the creek, your car, your kit and the county sheriff's number for the area.
What your Guardian should know
Your Guardian should expect long silences. A dot that freezes for an hour in a canyon is normal and not a reason to act. The two things that are: an SOS, or an overdue alert past the margin you agreed.
Give them the written plan and the decision tree. If you are overdue and not answering, they call 911 or the county sheriff for the area and share the trailhead, your car, your planned route, your turnaround time, and the last known location from the link. They should say you are an experienced runner but alone and unsupported. Holler never contacts 911 or search and rescue, so this call is theirs to make, and they should feel permitted to make it.
Send it as one message they can forward: "Solo 30 miles today, Cedar Ridge loop from the north trailhead, gray car. Turnaround 11:00 at the fire road, bail-out is the fire road to Route 9. No signal in the canyon from about mile 8 to 14. Finish around 2:30, return time 4:30. If I'm overdue and not answering, call the county sheriff, forward this message and the link, and say I'm an experienced runner alone and unsupported."
Questions people ask
Do I need a satellite messenger for ultra training?
If your routes spend long stretches without any cell coverage, a satellite device is the only way to call for help from there. On routes with reliable signal, a phone and a shared plan may be enough.
What stationary alert time makes sense on a long trail run?
Longer than your longest planned stop, which for many people means 15 to 30 minutes. Too short and a water refill triggers it.
What if my phone dies halfway?
Your Guardians keep your last known location, and the overdue alert still comes from Holler's server if you have not checked in after your return time.
Is it safe to train for an ultra alone?
Many ultrarunners train alone. The safety comes from the plan: route, turnaround time, gear for a night out, and a Guardian who knows exactly when to call for help. See is it safe to go ultrarunning alone.
Keep reading
Questions people ask about this
Sources: National Park Service: Ten Essentials, National Weather Service: Heat illness.