Thru-hiking at a glance
- Appalachian Trail
- About 2,200 miles
- Pacific Crest Trail
- About 2,650 miles
- Continental Divide Trail
- About 3,100 miles
- Typical duration
- Four to six months
What makes a hike a thru-hike
The distinction is continuity. A thru-hike is one trip, start to finish, in a single season. Walking the same trail in pieces over several years is section hiking, and it's a perfectly good way to do a long trail that simply isn't the same thing.
Why gear choices change at that scale
The scale changes what gear means. On a weekend a slightly heavy pack is an annoyance; over 2,000 miles it's an injury. Durability matters differently too, because a thru-hiker will wear out several pairs of shoes, and a shoe that lasts 400 miles is a known quantity to plan resupply around rather than a disappointment. Almost every convention in ultralight backpacking came out of people doing this and comparing notes.
Why it is mostly logistics
It also runs on logistics more than most hiking. Resupply points, permits, water carries in dry stretches, and the timing of a weather window at either end shape the trip as much as fitness does. On the big US trails, permits and quotas apply in places and change between years, so the trail's own association and the relevant land managers are the sources to plan against.
The three big US trails
The Appalachian Trail runs roughly 2,200 miles from Georgia to Maine and takes most people five to seven months. The Pacific Crest Trail runs about 2,650 miles from the Mexican border to Canada in four to six months. The Continental Divide Trail is the longest and least developed at roughly 3,100 miles, and the one where route choice is genuinely up to the hiker.
Completing all three is the Triple Crown. The mileages shift slightly year to year as reroutes land, which is itself a useful reminder that these are maintained corridors rather than fixed lines.
What actually ends a thru-hike
Rarely the walking. Overuse injury is the most common cause, and it usually arrives in the first month when people walk further than their bodies have adapted to. After that it is money, then motivation, then logistics: a missed permit window, a fire closure, a snow year that made a section unsafe on the schedule they had.
That is why the planning that matters is not gear. It is a start date that puts you in each section in the right conditions, a resupply plan that survives a slow week, and a mileage ramp that gives your tendons time.
What this means when you're choosing
- Durability over outright weight, since gear is replaced mid-trip either way
- Resupply spacing, which sets your food carry and your pack size
- Permits, which for several trails are the binding constraint
The common mistake
Optimising gear and ignoring logistics
Resupply, permits, water carries and snow timing decide more thru-hikes than pack weight does. People spend the winter shaving ounces and then get turned around by a permit date or a Sierra snowpack they did not plan around.
Common questions
What's the difference between thru-hiking and section hiking?
A thru-hike covers the whole trail in one continuous trip, usually in a season. Section hiking covers the same ground in separate trips over months or years, which suits people who can't take several months off.
How many pairs of shoes does a thru-hike take?
Commonly several, since trail shoe midsoles are done somewhere around 300 to 500 miles. Most long-trail hikers plan shoe replacements into their resupply schedule rather than waiting until the pair fails.