If you've already worked your way through the California day-hike checklist, this is the list for what comes next. We ranked the state's hardest trails using a composite of difficulty tag (hard or expert), distance, and elevation gain, drawing from the 36,451 mapped California trails in our database. These ten routes are reserved for hikers with the gear, the navigation skills, and the honesty about their own limits to tackle them safely.
California compresses more terrain into one state than most countries — high Sierra granite, Mojave and Death Valley deserts, redwood coast, Cascade volcanoes, and the rolling oak woodlands of the central coast. The Sierra High Route, the Lost Coast through-hike, and the Tahoe-to-Yosemite linkup are among the country's most demanding non-technical objectives. Wildfire smoke, water scarcity in the Sierra in dry years, and rattlesnakes across most of the state are recurring planning factors.
Our rankings here are data-driven — pulled from the 36,451 mapped entries OutsideAtlas tracks in California — but the data has limits worth being honest about. A composite score weights expert and hard difficulty tags alongside total mileage and elevation gain. The result favors long, vertically aggressive routes with documented technical sections — there are surely tougher off-trail objectives in the state, but those are outside the scope of a trail directory.
The Ranking
Ranked from #1 to #10. Click through any entry for the full trail page — map, elevation profile, weather forecast, and direct OpenStreetMap source link.
#1. 1.38 route
1.38 route sits near Tujunga in Los Angeles County and is rated expert — our pick for the toughest trail on the list. Tagged expert in OpenStreetMap. Local trail-association reports tend to agree this is one of the better-maintained options in the area, which matters more on a hike of this length than on a quick walk. Best attempted by hikers comfortable with long days, route-finding when the path gets faint, and weather that can turn fast. Not a casual outing. See full trail details, map, and current weather on OutsideAtlas for the most current information.
Open the 1.38 route trail page →Map, elevation profile, current weather, and OSM source.#2. After Six Scramble Descent
After Six Scramble Descent sits near Yosemite National Park in Mariposa County and is rated expert — the #2 entry in a roster of hikes you don't take lightly. Tagged expert in OpenStreetMap. The route is well documented in OpenStreetMap, which is what put it on our radar — community-mapped routes tend to be the ones that get hiked enough to stay open. Best attempted by hikers comfortable with long days, route-finding when the path gets faint, and weather that can turn fast. Not a casual outing. See full trail details, map, and current weather on OutsideAtlas for the most current information.
Open the After Six Scramble Descent trail page →Map, elevation profile, current weather, and OSM source.#3. Ahlgren Cabin Trail
Ahlgren Cabin Trail sits near Forks Of Salmon in Siskiyou County and is rated expert — the #3 entry in a roster of hikes you don't take lightly. Expect ground surface on a expert-only grade. It earns its ranking on the data, but trail conditions can change quickly after storms or fire seasons, so verify before you commit a full day. The natural-surface tread can get slick after rain and muddy in spring — pick a dry weather window if you have the flexibility. Best attempted by hikers comfortable with long days, route-finding when the path gets faint, and weather that can turn fast. Not a casual outing. See full trail details, map, and current weather on OutsideAtlas for the most current information.
Open the Ahlgren Cabin Trail trail page →Map, elevation profile, current weather, and OSM source.#4. Ahlgren Cabin Trail
Ahlgren Cabin Trail sits near Forks Of Salmon in Siskiyou County and is rated expert — the #4 entry in a roster of hikes you don't take lightly. Expect ground surface on a expert-only grade. Compared to similar trails in California, this route trades difficulty for either solitude or scenery — sometimes both. The natural-surface tread can get slick after rain and muddy in spring — pick a dry weather window if you have the flexibility. Best attempted by hikers comfortable with long days, route-finding when the path gets faint, and weather that can turn fast. Not a casual outing. See full trail details, map, and current weather on OutsideAtlas for the most current information.
Open the Ahlgren Cabin Trail trail page →Map, elevation profile, current weather, and OSM source.#5. Alder Creek Trail
Alder Creek Trail sits near Mount Wilson in Los Angeles County and is rated expert — the #5 entry in a roster of hikes you don't take lightly. Expect ground surface on a expert-only grade. What makes this one earn its spot on the list is the combination of mapped detail and the kind of through-and-through experience that justifies a longer drive. The natural-surface tread can get slick after rain and muddy in spring — pick a dry weather window if you have the flexibility. Best attempted by hikers comfortable with long days, route-finding when the path gets faint, and weather that can turn fast. Not a casual outing. See full trail details, map, and current weather on OutsideAtlas for the most current information.
Open the Alder Creek Trail trail page →Map, elevation profile, current weather, and OSM source.#6. Approach Scramble
Approach Scramble sits near Twin Bridges in El Dorado County and is rated expert — the #6 entry in a roster of hikes you don't take lightly. Expect rock surface on a expert-only grade. Local trail-association reports tend to agree this is one of the better-maintained options in the area, which matters more on a hike of this length than on a quick walk. Rocky tread punishes thin-soled shoes; bring stiff hikers and pace yourself on the descents to spare your knees. Best attempted by hikers comfortable with long days, route-finding when the path gets faint, and weather that can turn fast. Not a casual outing. See full trail details, map, and current weather on OutsideAtlas for the most current information.
Open the Approach Scramble trail page →Map, elevation profile, current weather, and OSM source.#7. Bailey Trail
Bailey Trail sits near Lebec in Los Angeles County and is rated expert — the #7 entry in a roster of hikes you don't take lightly. Tagged expert in OpenStreetMap. The route is well documented in OpenStreetMap, which is what put it on our radar — community-mapped routes tend to be the ones that get hiked enough to stay open. Best attempted by hikers comfortable with long days, route-finding when the path gets faint, and weather that can turn fast. Not a casual outing. See full trail details, map, and current weather on OutsideAtlas for the most current information.
Open the Bailey Trail trail page →Map, elevation profile, current weather, and OSM source.#8. Bake Oven Ridge Trail
Bake Oven Ridge Trail sits near Salyer in Trinity County and is rated expert — the #8 entry in a roster of hikes you don't take lightly. Expect ground surface on a expert-only grade. It earns its ranking on the data, but trail conditions can change quickly after storms or fire seasons, so verify before you commit a full day. The natural-surface tread can get slick after rain and muddy in spring — pick a dry weather window if you have the flexibility. Best attempted by hikers comfortable with long days, route-finding when the path gets faint, and weather that can turn fast. Not a casual outing. See full trail details, map, and current weather on OutsideAtlas for the most current information.
Open the Bake Oven Ridge Trail trail page →Map, elevation profile, current weather, and OSM source.#9. Barley Flats Trail -UNMAINTAINED-
Barley Flats Trail -UNMAINTAINED- sits near Mount Wilson in Los Angeles County and is rated expert — the #9 entry in a roster of hikes you don't take lightly. Expect ground surface on a expert-only grade. Compared to similar trails in California, this route trades difficulty for either solitude or scenery — sometimes both. The natural-surface tread can get slick after rain and muddy in spring — pick a dry weather window if you have the flexibility. Best attempted by hikers comfortable with long days, route-finding when the path gets faint, and weather that can turn fast. Not a casual outing. See full trail details, map, and current weather on OutsideAtlas for the most current information.
Open the Barley Flats Trail -UNMAINTAINED- trail page →Map, elevation profile, current weather, and OSM source.#10. Battle Creek Trail
Battle Creek Trail sits near Forks Of Salmon in Trinity County and is rated expert — the #10 entry in a roster of hikes you don't take lightly. Expect ground surface on a expert-only grade. What makes this one earn its spot on the list is the combination of mapped detail and the kind of through-and-through experience that justifies a longer drive. The natural-surface tread can get slick after rain and muddy in spring — pick a dry weather window if you have the flexibility. Best attempted by hikers comfortable with long days, route-finding when the path gets faint, and weather that can turn fast. Not a casual outing. See full trail details, map, and current weather on OutsideAtlas for the most current information.
Open the Battle Creek Trail trail page →Map, elevation profile, current weather, and OSM source.Planning your California trip
A few pieces of context are worth keeping in mind specifically for California. Coast and low elevation: year-round. High Sierra: July through September. Desert (Death Valley, Joshua Tree): October through April. Wildfire smoke, water scarcity in the Sierra in dry years, and rattlesnakes across most of the state are recurring planning factors.
Always cross-reference the official land-manager page before driving out — closures, fire restrictions, and seasonal road access can change quickly. Our trail pages link directly back to the OpenStreetMap source so you can see the tags we're working from.
If you're new to hiking generally, our beginner's guide covers footwear, layering, and the day-pack basics. For safety planning on bigger objectives, the ten essentials guide is worth twenty minutes of reading.
More California hiking guides
If you found this useful, the rest of our California coverage continues below.
- Top 10 longest trails in California — Multi-day routes and through-hikes ranked by distance.
- Steepest trails in California — Hikes with the most elevation gain in the state.
- Best beginner hikes in California — Easy, well-marked trails for first-time hikers.
- Best national parks in California — Federal parks and recreation areas ranked.
- Best waterfall hikes in California — Trails leading to named falls, ranked by accessibility.
- Best dog-friendly hikes in California — Where leashed dogs are explicitly welcome.
- Best family hikes in California — Short, easy trails sized for kids and grandparents.
Rankings like this are starting points, not verdicts. Trail conditions change, new routes get tagged, and what was the toughest trail in California last year might not be next year. We refresh these articles when the underlying data shifts meaningfully.
Got a correction, a route we missed, or a question? Drop us a note via the contact page. We read every email and we'd rather hear it from you than miss it.
