Leave No Trace: The 7 Principles, Without the Preachiness

By Michael Sally · Updated August 29, 2026 · Editorial policy

Leave No Trace gets taught like scripture and practiced like a suggestion. It works better understood as engineering: seven principles, each solving a specific, documented damage pattern that happens when millions of people love the same places. Here they are with the reasoning attached.

The seven, practically

1. Plan ahead and prepare

Unprepared hikers make emergency decisions — campfires in dry closures, shortcuts down fragile slopes, rescues that put other people at risk. Planning (route, weather, regulations, time estimate via the calculator) is a conservation act as much as a safety one.

2. Travel and camp on durable surfaces

Walk through the mud puddle, not around it — going around widens trails meter by meter into braided scars. Stay on the trail across switchbacks (cutting them channels erosion straight downhill), and camp on established sites, rock, or bare ground 200 feet from water.

3. Dispose of waste properly

Pack out all trash including the "biodegradable" stuff — orange peels and apple cores persist for months to years and teach wildlife to beg. Human waste: catholes 6–8 inches deep, 200 feet from water and trails, and in high-traffic or alpine zones, pack it out with a WAG bag where required. Yes, pack out toilet paper; animals dig up buried paper reliably.

4. Leave what you find

Artifacts, antlers, wildflowers, and even the pretty rock: individually trivial, multiplied by annual visitation devastating. Photographs scale; souvenirs don't.

5. Minimize campfire impact

Fire scars last decades and escaped campfires start a meaningful share of wildfires. Use a stove for cooking; if fires are legal and conditions safe, use existing rings, keep it small, burn to ash, drown completely — cold to the touch.

6. Respect wildlife

Feeding wildlife — deliberately or through sloppy food storage — habituates animals and routinely ends with the animal killed as a hazard. "A fed bear is a dead bear" is administrative fact, not slogan. Distance rules in parks (commonly 25 yards from most wildlife, 100 from bears and wolves) exist for the animal's sake and yours (wildlife safety).

7. Be considerate of other visitors

Yield sensibly (uphill hikers have right of way), keep speakers off — music travels absurdly far in quiet terrain — and keep dogs leashed where required.

The gray areas people actually argue about

The seven principles settle the easy cases; trail culture argues the edges, and the arguments have answers. Rock cairns: building unofficial ones isn't harmless art — cairns are navigation infrastructure in many places, and decorative ones send hikers off-route; leave stacking to trail maintainers and knock down nothing (an "unofficial-looking" cairn may be the route). Dog waste bags left trailside "for pickup later": the trail's most-broken promise; carry it out immediately or don't bring the dog. Fruit and nut shells tossed "for the animals": covered above — feeding is feeding, whether by hand or by peel. Geotagging pristine spots: genuinely contested; the defensible middle is tagging regions rather than pin-precise locations for fragile, unmanaged places, since visitation follows pins measurably. Wide-spot passing on narrow trails: step to the durable downhill side rather than trampling the uphill vegetation — and on that note, uphill hikers technically hold right of way but frequently wave descenders through to keep their own rest break; the yield rule serves communication, not enforcement.

The meta-principle under all of it: the practices exist because of multiplication, not because any single act matters much. Judging each choice by "what if the next ten thousand visitors did this too" resolves nearly every gray case without a rulebook.

Human waste, and why the cathole standard exists

The principle people are least willing to read about is the one with the largest measurable impact on water quality and on the experience of everyone behind you. It is worth being specific.

The default standard in most of the United States is a cathole: 15 to 20 centimetres deep, at least 60 metres — roughly 70 adult paces — from water, trails, and camp. Depth matters because the biologically active layer of soil is where decomposition happens; a shallow scrape leaves material that animals dig up and rain moves. Distance from water matters because that is the pathway by which pathogens reach the people filtering downstream.

Toilet paper is the part most often got wrong. Burying it is permitted in some places and prohibited in others, and it decomposes far more slowly than people assume, particularly in dry or cold environments. Packing it out in a sealed bag is the reliable answer and is increasingly the requirement rather than the courtesy.

An expanding set of environments require packing out solid waste entirely. Alpine zones above treeline, desert canyons, river corridors, glaciers, and heavily used areas such as Mount Whitney's main trail all now mandate wag bags or comparable systems, because the soil biology that makes catholes work either does not exist or cannot keep pace with visitation. Check the managing agency's current rules before you go rather than assuming the general standard applies — these requirements change, and they change most often in exactly the popular places you are most likely to visit.

The underlying logic generalises to the rest of the principles. None of them is about purity. They are about the arithmetic of many people doing the same small thing in the same place, which is why a practice that is harmless once becomes a rule when a trail sees thousands of visitors a season.