Pace Math and the Turnaround Time

Most hikers who end up walking out by headlamp did not misjudge the trail. They misjudged themselves — specifically, how fast they move uphill after the third hour — and they made the decision to keep going at the exact moment they were least equipped to make it. The fix is not more fitness. It is doing the arithmetic before you leave the car, from numbers you already have.

The number you already own

Every hike you've logged with a distance, a gain and a moving time is a data point about your real pace. Not the pace you'd like to have, and not the guidebook's estimate — yours, on that kind of terrain, on that kind of day. Look at your last handful of climbs and pull out two figures: how many miles you cover per hour on the flat, and how many feet of gain you take per hour on sustained uphill.

For most fit day hikers the flat number lands somewhere around two and a half to three miles an hour and the climbing number somewhere between a thousand and fifteen hundred feet an hour — but the point is not the average. The point is that your own logbook will tell you where you sit, and it will tell you honestly, because it was recorded by a watch and not by memory.

Doing the math at the trailhead

Take the route's distance and total gain. Divide the distance by your flat pace to get horizontal time; divide the gain by your climbing rate to get vertical time; add them together. That is your moving time to the top. Then add a real allowance for stops — a quarter of the moving time is about right for a day with photos and lunch — and double the total for the round trip, shaving a little off the descent if your logs show you descend faster than you climb.

• Route: 11 miles, 3,200 feet of gain.
• Flat time: 11 ÷ 2.7 ≈ 4 hours.
• Vertical time: 3,200 ÷ 1,200 ≈ 2.7 hours.
• Moving time to the top: call it 4 hours once you've split the gain across the climbing sections rather than stacking it on top.
• With stops and the descent: a 7-hour day, give or take.

That number, compared to the hours of daylight you have, is your answer. If it fits with an hour to spare, go. If it doesn't, you either start earlier or pick a turnaround point short of the summit — and you pick it now.

The turnaround time is a promise to rested you

Set the clock time at which you turn around regardless of where you are, and say it out loud to whoever you're hiking with. Not "we'll see how it looks at the saddle." A clock time. The version of you standing four hundred feet below the summit at two in the afternoon, tired and close, is not the person who should be deciding whether to press on; that person will always press on. The person who should decide is the one at the trailhead with a full water bottle and no summit in sight, and the only way that person gets a vote is by making the decision in advance.

A turnaround time you're willing to renegotiate is not a turnaround time. It is a suggestion, and suggestions lose to summit fever every time.

Let the logbook close the loop

The estimate is only as good as the pace figures behind it, and those figures get better every time you log a hike and compare the plan to the day. If you consistently arrive an hour early, your climbing rate is conservative and you can plan bigger. If you consistently arrive late, the guidebook is not the problem. Either way you're planning from evidence instead of optimism, and the headlamp goes back to being an emergency item rather than the way you finish every long day.