When hikers ask which trails in Idaho are worth a full day — or several — the conversation always circles back to the same handful of routes. Below we've ranked the ten longest hiking trails in Idaho by total mapped distance, drawing from the 8,042 trails OutsideAtlas currently tracks in the state. Each entry includes the distance, what makes the route distinctive, and an honest note on who should actually attempt it.
Idaho is more mountainous than its neighbors realize — the Sawtooths, Bitterroots, and Lost River Range carry alpine terrain rivaling Colorado in remoteness if not raw elevation. The Idaho Centennial Trail and CDT (eastern panhandle) provide the longest mapped through-routes. July through September is the high-country window; lower-elevation desert hiking (City of Rocks) extends April-October.
Our rankings here are data-driven — pulled from the 8,042 mapped entries OutsideAtlas tracks in Idaho — but the data has limits worth being honest about. OpenStreetMap distance tags are crowd-sourced and inconsistent. A route may appear longer or shorter than the official measurement, especially when long-distance trails (like state and national scenic trails) are tagged in segments rather than as a single relation.
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. Blackfoot River Bridge
Blackfoot River Bridge earns the #1 spot for its sheer distance, though the exact mileage in OpenStreetMap data is a rough estimate. Expect 3,258 ft of gain on a forgiving 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. Plan as a multi-day if you're not used to single-push 20+ mile days; resupply or shuttle logistics matter here. See full trail details, map, and current weather on OutsideAtlas for the most current information.
Open the Blackfoot River Bridge trail page →Map, elevation profile, current weather, and OSM source.#2. Marco Flat Bridge
Marco Flat Bridge earns the #2 spot for its sheer distance, though the exact mileage in OpenStreetMap data is a rough estimate. Expect 3,268 ft of gain on a forgiving grade. 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. Plan as a multi-day if you're not used to single-push 20+ mile days; resupply or shuttle logistics matter here. See full trail details, map, and current weather on OutsideAtlas for the most current information.
Open the Marco Flat Bridge trail page →Map, elevation profile, current weather, and OSM source.#3. Ptarmigan Tunnel
Ptarmigan Tunnel earns the #3 spot for its sheer distance, though the exact mileage in OpenStreetMap data is a rough estimate. Expect 7,100 ft of gain on a forgiving 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. Plan as a multi-day if you're not used to single-push 20+ mile days; resupply or shuttle logistics matter here. See full trail details, map, and current weather on OutsideAtlas for the most current information.
Open the Ptarmigan Tunnel trail page →Map, elevation profile, current weather, and OSM source.#4. Pioneer Park Heritage #321 (Kalispel Interpretive Trail)
Pioneer Park Heritage #321 (Kalispel Interpretive Trail) earns the #4 spot for its sheer distance, though the exact mileage in OpenStreetMap data is a rough estimate. Expect wood surface on a forgiving grade. Compared to similar trails in Idaho, this route trades difficulty for either solitude or scenery — sometimes both. Plan as a multi-day if you're not used to single-push 20+ mile days; resupply or shuttle logistics matter here. See full trail details, map, and current weather on OutsideAtlas for the most current information.
Open the Pioneer Park Heritage #321 (Kalispel Interpretive Trail) trail page →Map, elevation profile, current weather, and OSM source.#5. Drinking Water Redtail Campground McCroskey State Park
Drinking Water Redtail Campground McCroskey State Park earns the #5 spot for its sheer distance, though the exact mileage in OpenStreetMap data is a rough estimate. Expect gravel surface on a forgiving 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. A gravel-and-dirt tread holds up well after rain, though loose surface on descents calls for trekking poles or careful footing. Plan as a multi-day if you're not used to single-push 20+ mile days; resupply or shuttle logistics matter here. See full trail details, map, and current weather on OutsideAtlas for the most current information.
Open the Drinking Water Redtail Campground McCroskey State Park trail page →Map, elevation profile, current weather, and OSM source.#6. Indian Cliff Parking to Trail of the Coeur d'Alenes
Indian Cliff Parking to Trail of the Coeur d'Alenes earns the #6 spot for its sheer distance, though the exact mileage in OpenStreetMap data is a rough estimate. Expect dirt surface on a forgiving 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. The natural-surface tread can get slick after rain and muddy in spring — pick a dry weather window if you have the flexibility. Plan as a multi-day if you're not used to single-push 20+ mile days; resupply or shuttle logistics matter here. See full trail details, map, and current weather on OutsideAtlas for the most current information.
Open the Indian Cliff Parking to Trail of the Coeur d'Alenes trail page →Map, elevation profile, current weather, and OSM source.#7. Living Hope Seventh-day Adventist Church Sidewalk
Living Hope Seventh-day Adventist Church Sidewalk earns the #7 spot for its sheer distance, though the exact mileage in OpenStreetMap data is a rough estimate. Expect concrete surface on a forgiving grade. 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. A paved surface makes this one of the more accessible options on the list — good for strollers, mobility aids, and wet-weather days. Plan as a multi-day if you're not used to single-push 20+ mile days; resupply or shuttle logistics matter here. See full trail details, map, and current weather on OutsideAtlas for the most current information.
Open the Living Hope Seventh-day Adventist Church Sidewalk trail page →Map, elevation profile, current weather, and OSM source.#8. #19 Access Trail (Shoshone-Paiute Tribes Trail)
#19 Access Trail (Shoshone-Paiute Tribes Trail) earns the #8 spot for its sheer distance, though the exact mileage in OpenStreetMap data is a rough estimate. Expect unpaved surface on a forgiving 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. A paved surface makes this one of the more accessible options on the list — good for strollers, mobility aids, and wet-weather days. Plan as a multi-day if you're not used to single-push 20+ mile days; resupply or shuttle logistics matter here. See full trail details, map, and current weather on OutsideAtlas for the most current information.
Open the #19 Access Trail (Shoshone-Paiute Tribes Trail) trail page →Map, elevation profile, current weather, and OSM source.#9. Nez Perce (Nee Mee Poo) National Historic Trail
Nez Perce (Nee Mee Poo) National Historic Trail earns the #9 spot for its sheer distance, though the exact mileage in OpenStreetMap data is a rough estimate. Expect ground surface on a forgiving grade. Compared to similar trails in Idaho, 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. Plan as a multi-day if you're not used to single-push 20+ mile days; resupply or shuttle logistics matter here. See full trail details, map, and current weather on OutsideAtlas for the most current information.
Open the Nez Perce (Nee Mee Poo) National Historic Trail trail page →Map, elevation profile, current weather, and OSM source.#10. North Fork Badger-Goat Mountain Connector Trail
North Fork Badger-Goat Mountain Connector Trail earns the #10 spot for its sheer distance, though the exact mileage in OpenStreetMap data is a rough estimate. Expect ground surface on a forgiving 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. Plan as a multi-day if you're not used to single-push 20+ mile days; resupply or shuttle logistics matter here. See full trail details, map, and current weather on OutsideAtlas for the most current information.
Open the North Fork Badger-Goat Mountain Connector Trail trail page →Map, elevation profile, current weather, and OSM source.Planning your Idaho trip
A few pieces of context are worth keeping in mind specifically for Idaho. July through September is the high-country window; lower-elevation desert hiking (City of Rocks) extends April-October. Grizzly bears in the Greater Yellowstone region (eastern Idaho), forest fires in late summer, and major stream crossings on backcountry routes are the standard concerns.
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 Idaho hiking guides
If you found this useful, the rest of our Idaho coverage continues below.
- Steepest trails in Idaho — Hikes with the most elevation gain in the state.
- Best beginner hikes in Idaho — Easy, well-marked trails for first-time hikers.
- Most challenging hikes in Idaho — Expert-rated routes for experienced hikers only.
- Best national parks in Idaho — Federal parks and recreation areas ranked.
- Best waterfall hikes in Idaho — Trails leading to named falls, ranked by accessibility.
- Best dog-friendly hikes in Idaho — Where leashed dogs are explicitly welcome.
- Best family hikes in Idaho — 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 Idaho 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.
