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Why mountain hikes need a difficulty rating
The yellow signpost says “Pass, 2 hr 30 min,” the trail description promises “a beautiful hike,” and the first cable-protected section shows up an hour in. Nothing you read was wrong; nothing said it would be this steep, either. That’s the whole job of a difficulty rating: telling you how hard a route is before you find out for yourself.
The French Hiking Federation (FFRandonnée) spelled out the problem: every GPS track website, guidebook publisher, and tour operator had its own method, with no common standard, which led to misjudgments and sometimes to route choices with unfortunate consequences, especially for beginners [1]. Each Alpine country has its own answer. They look nothing alike, but you read them all the same way: by the hardest section, and in good weather. Climbing grades, a different family, follow the same logic: see the climbing grades conversion chart.
The Swiss Alpine Club’s T1 to T6 scale
The Swiss Alpine Club (SAC) rates hikes on six levels, from T1 to T6, on a scale revised in 2023. For each level, it describes the typical terrain and what it demands of you, and gives examples of Swiss routes; a “+” or “-” sign fine-tunes the rating, as in T3+ or T4- [2].
| Level | Typical terrain | Requirements | Example given by the SAC |
|---|---|---|---|
| T1 | Well-built path or trail; any exposed spots very well secured | No specific requirements; route-finding is easy | Mont Raimeux |
| T2 | Trail with a continuous line, terrain steep in places, risk of falling not ruled out | Good balance, basic navigation skills | Moléson |
| T3 | Trail not always visible, exposed sections sometimes protected by cables or chains, scree | Sure footing, average navigation skills, basic alpine experience | Cabane d’Orny |
| T4 | Traces of a trail, often trailless, easy climbing (I), easy snowfields, glacier sections | Comfortable on exposed sections, good navigation skills, basic use of mountaineering gear | Tour d’Aï |
| T5 | Often trailless, easy climbing (I-II), very steep slopes, glaciers sometimes marked | Very sure footing, extensive alpine experience, good command of mountaineering gear | Bristen |
| T6 | Mostly trailless, longer climbing sections (II), very exposed terrain | Perfectly sure footing, seasoned alpine experience | Tour Sallière |
Summary of the SAC hiking scale, version dated August 8, 2023. The SAC specifies that routes are rated assuming good weather, good visibility, dry ground, and no snow.
The SAC also ties its scale to Switzerland’s official trail marking. Most trails waymarked in yellow fall in the T1 to T2 range, mountain trails waymarked white-red-white in the T2 to T3 range, and alpine trails waymarked white-blue-white in the T4 to T5 range; the club warns that trails often fall above or below these ranges [2].
Blue, red, black: trails in Austria and Germany
In the Austrian and German Alps, the Alpine clubs borrow the color code of European ski runs, which differs from the one on U.S. slopes: blue for an easy mountain trail, red for a trail of intermediate difficulty, black for a difficult one. The color appears as a dot on the yellow signposts; the markings painted along the trail, on the other hand, are usually red-white-red, whatever the difficulty [3].
- Blue (T2): mostly narrow trails, sometimes steep, with no section where a fall would be serious [3].
- Red (T3): narrow trails, often steep, with sections where a fall could be serious and sometimes short stretches protected by fixed cables [3].
- Black (T4 to T6): narrow, steep, and exposed trails, with frequent protected sections or easy climbing that takes your hands; sure footing and a head for heights are essential [3].
Two rules matter when you read these colors. A trail’s difficulty up to the destination on the sign is judged by its hardest section, and the rating assumes good trail and weather conditions [4]. The German Alpine Club is emphatic: wet ground, rain, or leftover snow can increase the difficulty massively [3].
In France: effort, technical difficulty, and risk, from 1 to 5
In France, trail marking distinguishes types of route, GR, GR de Pays, and PR, by their length, not by their difficulty: GRs are long-distance trails of several days or weeks, GR de Pays are multi-day loops within one region, and PRs are hikes of a few hours to a day [5]. For difficulty, the French Hiking Federation has developed, with its partner IBP Index, a rating system based on three criteria, each scored from 1 to 5: effort, technical difficulty, and risk [1] [6].
| Level | Effort (IBP index) | Technical difficulty: the biggest obstacle | Risk in a fall |
|---|---|---|---|
| 1 | Easy (0 to 25) | Practically no obstacles | Low: minor injury |
| 2 | Fairly easy (26 to 50) | Obstacles up to ankle height | Fairly low: sprain possible |
| 3 | Moderate (51 to 75) | At least one obstacle up to knee height | Moderate: serious injuries possible in places |
| 4 | Fairly difficult (76 to 100) | At least one obstacle up to hip height; poles needed for balance | Fairly high: danger of death possible |
| 5 | Difficult (over 100) | Obstacle higher than the hip; hands needed | High: a fall would certainly be fatal |
Summary of the French Hiking Federation’s practical rating guide (2020). Effort is calculated by uploading a GPS track to the federation’s tool; for technical difficulty and risk, the highest level you encounter is the one that counts.
Like its neighbors, this rating comes with fine print. It applies to an adult of average height, with no snow, on dry ground, and in mild weather; on a multi-day hike, it applies to each stage. The federation points out that the real difficulty also depends on the weather, the weight of your backpack, your training, and how you feel that day [6].
Reading a rating without fooling yourself
The three systems don’t measure the same thing. The Swiss scale and the Austrian and German colors mainly describe terrain and exposure; the French ratings separate physical effort, technical moves, and how bad a fall would be. None of the organizations cited here publishes a correspondence between the French ratings and the Swiss scale: don’t try to translate a “3” into a “T3.”
Hiking time, finally, isn’t part of any of these ratings. To estimate it, our guide to hiking time explains the French, British, and German methods. And if you’re planning a multi-day route like the Tour du Mont-Blanc, check the rating of each stage, not just the one for the whole route.
The smart move: look up the rating of the hardest section on the route, then ask yourself honestly whether you’ve handled one like it before, and in what kind of weather.
FAQ
What does T3 mean on a hiking trail?
It’s the third level on the Swiss Alpine Club’s scale, the one the club calls “difficult mountain hiking” in English: a trail that isn’t always visible, exposed sections sometimes protected by cables or chains, scree, and hands sometimes needed for balance. It calls for sure footing, average navigation skills, and basic alpine experience. The German Alpine Club equates it with its red trails.
What do the blue, red, and black dots on trail signs in Austria mean?
They show the difficulty of the trail up to the destination on the sign, based on its hardest section: blue for an easy mountain trail, red for a trail of intermediate difficulty, possibly with exposed sections, and black for a difficult, exposed trail with protected sections or easy climbing. The rating assumes good conditions.
How does the French Hiking Federation’s rating system work?
It scores three criteria from 1 to 5. Effort is calculated by uploading a GPS track to the tool run by the federation and its partner IBP Index. Technical difficulty depends on the size of the biggest obstacle, from ankle height to above the hip. Risk depends on how serious a fall could be. It assumes an adult, no snow, dry ground, and mild weather.
Can a hike rated easy be dangerous?
Yes. Every one of these ratings assumes good conditions: good weather, dry ground, no snow. Rain, a late-season snowfield, or fog can make an easy section dangerous, and the German Alpine Club warns that wet ground or leftover snow can increase the difficulty massively. Check the forecast and conditions, and turn around if you need to.
Sources
- French Hiking Federation (FFRandonnée), “Cotation des randonnées pédestres” (in French), February 3, 2025, accessed October 22, 2026. ffrandonnee.fr https://www.ffrandonnee.fr/randonner/securite/cotation-des-randonnees-pedestres ↩
- Swiss Alpine Club (SAC), “Échelle CAS pour la cotation des randonnées : définitions” (in French), August 8, 2023, document published by the SAC’s Geneva section, accessed October 22, 2026. cas-geneve.ch https://www.cas-geneve.ch/pdf/20230808_CAS_echelle_cotation_randonnee_final.pdf ↩
- German Alpine Club (Deutscher Alpenverein), “Schwierigkeitsgrade von Bergwegen” (in German), July 2, 2025, accessed October 22, 2026. alpenverein.de https://www.alpenverein.de/artikel/schwierigkeitsgrade-von-bergwegen_8de95a6d-b490-4963-86cf-a0907c48a331 ↩
- Austrian Alpine Club (Österreichischer Alpenverein), “Wegekategorien und Schwierigkeitsangaben” (in German), accessed October 22, 2026. alpenverein.at https://www.alpenverein.at/portal/huetten-wege/wegenetz/wegekategorien/index.php ↩
- French Hiking Federation (FFRandonnée), “Les itinéraires de randonnée” (in French), accessed October 22, 2026. ffrandonnee.fr https://www.ffrandonnee.fr/randonner/ou-pratiquer/les-itineraires-de-randonnee ↩
- French Hiking Federation (FFRandonnée) and IBP Index, “Guide pratique de cotation des randonnées pédestres” (in French), 2020, accessed October 22, 2026. ffrandonnee.fr https://www.ffrandonnee.fr/Media/Default/Documents/randonner/Guide-cotation-ffrandonnee-2020.pdf ↩
Camping, backpacking, bushcraft and hiking
Guillaume Hoarau writes for Outfarer about camping, backpacking, bushcraft, and hiking. A survival-skills buff and a collector of vintage field manuals, he loves clear explanations, lists that actually help and other people’s stories, which he tells well.
