America’s public lands,
on one free atlas.
Trails. Parks. Wilderness.
Search 575,122+ hiking trails, 15,666+ federal parks & campgrounds, and the wilderness areas that surround them. Distance, elevation, difficulty, weather, and access — all from public data. No paywall. No login.
Plan your next outdoor day in four clicks
Trails, parks, campgrounds, and recreation areas — everything you need to choose, prepare, and get out, designed around the data, not the algorithm.
Browse by state
Drill from any US state down to counties, cities, parks, campgrounds, and individual trails.
Explore all states →Find what’s nearby
Use your location to surface the closest trails, parks, and campgrounds. Filter by distance and difficulty.
Show me nearby →Plan a camping trip
Browse 15,666 federal campgrounds, recreation areas, and parks with capacity, hookups, and amenities.
Browse parks & camping →Read the guides
State rankings for trails, waterfalls, and parks. Gear primers, weather strategy, and the booking playbook for popular campgrounds.
Open the blog →National recreation areas
Federal recreation areas and campgrounds from Recreation.gov.
Built on public data, not paywalls.
Most outdoor apps lock the basics behind a subscription. OutsideAtlas pulls trail geometry straight from OpenStreetMap and park, campground, and recreation-area inventory straight from Recreation.gov — the same public records used by professional cartographers, federal land managers, and the National Park Service.
Every trail page links back to its OSM source. Every park page links to Recreation.gov for booking. If you spot something wrong, you can correct it upstream and the fix propagates to everyone using the data — not just us.
Live data, refreshed weekly
The full trail and park database is rebuilt every week from the upstream sources.
Real weather forecasts
Five-day forecasts on every trail page via Open-Meteo, cached for performance.
Consistent difficulty rating
One algorithm across all 532K trails — SAC scale plus distance and elevation. No crowd bias.
Privacy-first
No accounts, no tracking, no PII. Favorites are stored in your browser, not on our servers.
Top states by trail & park count
Drill into the most outdoor-rich states. Each page covers every trail, park, county, and campground we’ve indexed.
New York
Texas
Oklahoma
California
Washington
Massachusetts
Michigan
Pennsylvania
Virginia
Colorado
New Jersey
North Carolina
Pick a difficulty that matches the day
Difficulty is derived from terrain classification, distance, and elevation — same algorithm everywhere.
Hand-picked trails
A featured slice of the 575,122 mapped trails in our database.
Latest from the OutsideAtlas Blog
Photo: Silvia GrešováHow to Read the SAC Hiking Scale (and Why It Matters)
The SAC scale is the most common trail difficulty system on OpenStreetMap. Here's how to interpret each tier — and why a T3 can ruin your day if you're not ready.
Photo: Joshua EarleThe 10 Essentials: What to Actually Pack on Every Day Hike
The 10 Essentials are the minimum survival kit for any hike. Here's what they are, why each one is on the list, and what to skip.
Photo: Maddi BazzoccoA Complete Beginner's Guide to Hiking (Without the Marketing)
Your first hike doesn't have to be a disaster. A practical step-by-step for picking a trail, packing right, and building real outdoor skills.
Photo: Patrick HendryHow to Score Hard-to-Get Campsites on Recreation.gov
Booking a Yosemite or Glacier campsite at peak season feels impossible. Here's the strategy that actually works.
Photo: Tobias MrzykHow Trail Difficulty Ratings Actually Work (and Why They Lie)
Every trail app rates trails differently. Here's why an "easy" trail in one app can be a "hard" trail in another — and how to read between the lines.
Photo: Joshua EarleWhen to Visit Each Major National Park (Without the Crowds)
Summer at Yosemite means three-hour shuttle lines. Here's when each major US national park is actually worth visiting.
Find a trail. Pick a park. Book a campsite.
Go outside.
Pick a state, search a name, or let us find what’s closest to where you’re standing. One free atlas — trails, parks, campgrounds, and wilderness — refreshed weekly.