Leave No Trace: The 7 Principles Explained
Leave No Trace (LNT) gets treated like a slogan. It's not. It's a framework developed by the Leave No Trace Center for Outdoor Ethics that gives hikers and campers a practical set of behaviors for reducing their impact on public land.
The math matters here. The difference between 1 million visitors doing it well versus doing it poorly is measurable in soil compaction, water quality, wildlife stress, and vegetation recovery. These principles aren't abstract environmentalism. They're the reason trails still exist in the condition they do.
Here's what each principle actually means in practice.
1. Plan Ahead and Prepare
Good planning isn't just about logistics. It's the foundation for low-impact travel.
Before you go: know the regulations for the specific land you're visiting, and understand how national forests differ from national parks in terms of what's permitted. Group size limits in wilderness areas are typically 12 people maximum, but many areas cap at 8. Knowing the limit before you invite your extended network saves everyone a problem at the trailhead.
Check weather forecasts from a reliable source (the National Weather Service, not a weather app built on less granular data). Know what fire restrictions are in place. Carry a map you can actually read if your phone dies.
Repackage food to reduce trash volume before leaving home. Plan meals to minimize leftovers. If you're going into bear country, know whether a canister is required or recommended.
Planning ahead also means having a turnaround time and telling someone where you're going. These aren't LNT principles per se, but they reduce the kind of emergency response situations that damage terrain and consume resources.
2. Travel and Camp on Durable Surfaces
Trail systems exist for a reason. When a trail is established, the surrounding ground is allowed to recover. When people shortcut switchbacks or spread out across fragile terrain, recovery takes years.
On-trail: stay on the established trail. Step in the mud if you have to. Going around a muddy section widens the trail and kills vegetation on the margins.
Off-trail: when off-trail travel is appropriate (above treeline, in desert, on rock), spread out. Don't follow the same line across fragile alpine meadows (like those in the Uinta-Wasatch-Cache high country) or cryptobiotic soil crust in the desert (a real concern in Coconino National Forest near Sedona). That crust can take decades to recover from a single footprint.
For campsites: use existing established sites where available. If you're in a high-use area, choose a site that's already hardened. If you're in a rarely visited area, choose a site on rock, gravel, or dry grass, and move your camp each night if you're staying multiple days.
The 200-foot rule: camp at least 200 feet from any water source. That's roughly 70 adult steps. This protects streambanks and lakeshores from compaction and keeps human activity away from the zones where wildlife water and feed.
3. Dispose of Waste Properly
Pack it in, pack it out. Everything. Orange peels, apple cores, sunflower shells. These do not decompose quickly in alpine environments and they attract wildlife.
Human waste in the backcountry requires a cat hole: a hole 6-8 inches deep, at least 200 feet from water, trails, and camp. Cover and disguise the hole when finished. Use a stick to mix in soil.
Toilet paper: pack it out in a small zip-lock bag. Some land managers require this even when cat holes are permitted. In popular areas (heavily used Sierra Nevada corridors like the Mt. Whitney trail, slot canyons, Colorado River corridor), wag bags (portable waste disposal bags) are required. Check the specific area's regulations before your trip.
Waste water from cooking and washing: scatter it at least 200 feet from water sources. Strain food particles out of dish water and pack them out with your trash.
4. Leave What You Find
Leave rocks, plants, animals, and historical artifacts as you find them. This one sounds obvious until you watch someone pocket a chunk of petrified wood from a national monument or pick wildflowers from an alpine meadow.
Cultural and archaeological sites are protected by federal law (the Archaeological Resources Protection Act). Moving or disturbing artifacts can result in significant fines. If you find something that looks like an artifact, photograph it, note the location, and report it to the ranger district.
For plants: picking one flower seems harmless. In a heavily visited meadow where thousands of people do the same thing, the cumulative impact is real. Leave them.
For rocks and natural objects: same principle. The goal is for the next visitor to find the landscape as you found it.
5. Minimize Campfire Impacts
Campfires have significant impact: they consume wood that provides habitat and nutrients, leave ash and char, and in dry conditions create genuine fire risk.
Use a camp stove for cooking whenever possible. Stoves are faster, cleaner, and work when fires aren't allowed.
When you do have a fire: use an existing fire ring. Never build a new ring where one doesn't exist. Keep fires small. Use only wood that is dead, downed, and small enough to burn completely. Don't drag in large logs. Don't leave a fire unattended. Drown it completely: stir the ash with water until it's cold to the touch, not just dim.
Above treeline, fires are generally inappropriate and often prohibited. Wood is scarce, decomposition is slow, and fire scars last for decades at altitude.
Fire restrictions change with conditions. During dry periods, many forests move to Stage 1 or Stage 2 restrictions that prohibit open flames entirely. Check current restrictions before you build any fire on public land. In California, a campfire permit is required for any open flame on national forest land during fire season.
6. Respect Wildlife
Distances matter and they're specific. The general rules for national parks and wilderness areas: stay at least 100 yards (the length of a football field) from bears and wolves. Stay at least 25 yards from all other wildlife, including bison, elk, deer, and birds of prey.
Never feed wildlife. This sounds obvious but it kills animals. Animals conditioned to human food lose their ability to forage and become aggressive toward humans, which ends with the animal being euthanized. "A fed bear is a dead bear" is not hyperbole.
Bear canisters are required in many wilderness areas and strongly recommended everywhere else. Even where hanging is technically allowed, it's no longer considered reliable in many areas where bears have learned to defeat it.
Store all food, scented items (toothpaste, sunscreen, chapstick, trash), and cooking equipment in a bear canister or bear box at night and when you're away from camp.
Move through wildlife habitat quietly. If an animal changes its behavior because of you, you're too close. Wildlife encounters are especially common on trails in Flathead National Forest, where grizzlies are active in the backcountry, and in the high-elevation zones of the White River National Forest in Colorado during elk rut season.
7. Be Considerate of Other Visitors
The trail has a social contract. A few specific rules that most people don't know:
Yield uphill: downhill hikers yield to uphill hikers. Going uphill is harder and requires a rhythm. Let them pass.
Horses have the right of way over everything. When horses approach, step off the trail on the downhill side, stand still, speak calmly so the horse knows you're human and not a predator, and wait until the group has passed. Ask the rider which side to stand on if you're unsure.
Headphones: keep one ear free on narrow trails. You need to hear other hikers, trail runners, and mountain bikers approaching from behind.
Group behavior: large groups should stop at wide spots to let solo hikers and pairs pass. Keep group noise at a level appropriate to the setting.
The Bottom Line
LNT is not about perfection. You will step off trail to pass someone. You will spill something. The point is to make decisions that minimize impact, not to achieve a zero-footprint standard that doesn't exist.
What matters is scale. When the behavior of millions of people shifts even slightly toward lower impact, public lands recover. When it doesn't, they degrade. Every visit is a small vote in that outcome.
Frequently Asked Questions
Are campfires always allowed in national forests and wilderness areas?
No. Campfire rules change with conditions and location. During dry periods, many forests issue Stage 1 or Stage 2 fire restrictions that prohibit open flames entirely, including camp stoves with open flames. Above treeline, fires are generally inappropriate and often prohibited year-round. In California, a free campfire permit is required for any open flame on national forest land during fire season even on a dispersed site. Always check current fire restrictions for the specific forest and ranger district before your trip.
What should I do with human waste when there's no outhouse available?
Dig a cat hole 6-8 inches deep and at least 200 feet from water, trails, and camp. Use a stick to break up solid waste and mix in soil before covering. Pack out toilet paper in a sealed zip-lock bag rather than burying it, as paper decomposes slowly and animals dig it up. In some heavily used corridors (slot canyons, alpine zones, certain river corridors), wag bags (portable waste disposal bags) are required because cat holes aren't feasible. Check the specific area's regulations before your trip.
Does LNT apply differently on national forest land versus national park land?
The core principles are the same across all public land, but how individual rules are enforced and what's required varies by managing agency and specific land unit. National park rules tend to be more restrictive: dispersed camping is not allowed, fires are more tightly controlled, and dogs are prohibited on most trails. On national forest land, dispersed camping is generally permitted, dogs are allowed on most trails on a leash, and fire rules vary by season and district. See the full comparison of national forests vs. national parks for specifics.