
The 100 km of the Trail del Marganai spread some 5,000 m of climbing over a chain of short, very steep ramps in south-west Sardinia rather than a few long passes. The hardest of them comes after the 80 km mark, when you have already been moving for well over half a day, and your preparation has to get you there with something left.
The loop starts and finishes in Buggerru, practically at sea level, and climbs into the Marganai forest, a landscape where woodland, ancient archaeological sites and the remains of mining sit side by side. The first third rises in waves to just over 600 m. The first longer climb, from km 8, averages a little over five percent and is still running terrain.
From km 34 the character changes. A climb of just under two kilometres at more than 15 percent on average opens the way onto the highest ground of the loop, around 850 m. Between km 50 and 57 three steep pitches follow each other with almost no recovery, the last averaging close to 20 percent. Overall almost half of the course is steep, uphill or down, and flat running makes up barely a twelfth.
The decisive climb comes late: from km 82 the loop gains a good 430 m in under three kilometres. It then stays above 400 m for a long stretch before the final five kilometres or so drop steeply back into Buggerru.
| Start | Length | Ø | Max. | Gain | Cat. |
|---|---|---|---|---|---|
| km 7.8 | 3.8 km | 5.5 % | 16.5 % | +206 m | Cat. 3 |
| km 21 | 2.1 km | 8.5 % | 24.8 % | +176 m | Cat. 3 |
| km 34 | 1.8 km | 15.5 % | 42.3 % | +278 m | Cat. 3 |
| km 49.7 | 1.6 km | 11.1 % | 25.3 % | +180 m | Cat. 3 |
| km 52.9 | 1.8 km | 13.4 % | 27.2 % | +234 m | Cat. 3 |
| km 54.9 | 1.6 km | 19.2 % | 33 % | +307 m | Cat. 3 |
| km 61.4 | 2.1 km | 8.4 % | 25.3 % | +177 m | Cat. 3 |
| km 81.9 | 2.8 km | 15.7 % | 38 % | +431 m | Cat. 2 |
Climb categories follow the road-cycling convention and rate the terrain itself (length and gradient) regardless of sport: Cat. 4 marks the easiest rated climbs, Cat. 1 the hardest, and HC (hors catégorie, “beyond categorization”) is reserved for the most brutal ascents. Short climbs below the Cat. 4 threshold stay unrated.
On this loop what counts is not how fast you get up the ramps but how little they cost you. The steep pitches are short, yet often well above 15 percent: hike them at an even, economical effort and save your running for the gentler rollers in between. Twelve aid stations break the day into manageable pieces, so plan from station to station rather than towards the finish.
The race is decided in the second half, in the block between km 50 and 57 and above all on the long climb from km 82. Take the first block on the momentum of the opening hours and you reach the second one empty. With three time gates on the course, that kind of collapse can end your race rather than just slow it.
The real trap is downhill. Almost a quarter of the course descends steeply, and if you let the early descents run away with you, your quads pay for it exactly when the final steep drop to Buggerru arrives.

For most recreational runners the loop means 16 to 24 hours on the move inside the 25-hour limit, which in early March inevitably includes hours in the dark. The effort is aerobic at its core but constantly interrupted by short, hard pitches that drive your heart rate up even while you are walking.
The hardest sections come late: the block around km 55 and the climb from km 82, more than 400 m in one go. Train steep, powerful hiking over 300 to 450 m of ascent, and do it at the end of long sessions rather than fresh. Downhill running on tired legs matters just as much, because the final descent comes after nearly a full day of racing.
Build your long weekends as back-to-back days: a long run with as much climbing as you can find, then a second session on tired legs the next day. That teaches you to stay efficient on steep ground once your strength is fading. Practise eating on the move as well; with twelve aid stations, a station-to-station plan is only as good as your stomach.
The early date puts your biggest weeks in January and February, the darkest part of the year. Use that for headlamp runs on trails, because that is how you will cover part of the race.

Download the Trail del Marganai course as a GPX file for your watch or bike computer.
Ben connects your goal, the course, current load, recovery, and calendar. Your plan stays pointed at race day even when real life is not perfectly plannable.
Trail del Marganai is 100 km long. That distance shapes how much aerobic endurance, pace durability, and race-specific work belong in the training plan.
Trail del Marganai has around 4,637 m of elevation gain over 100 km. That affects pacing, muscular load, and preparation for late-race sections.
Trail del Marganai is classified as Mountainous, averaging 45.9 vertical metres per kilometre. 8% of the route is flat, 24% climbs moderately (2 to 6%) and 24% is steeper than 6%.
The hardest climb of Trail del Marganai starts at kilometre 81.9, runs for 2.8 km at an average of 15.7% and gains 431 metres. Cycling-convention rating: Cat. 2. 8 climbs are mapped in total.
Yes, Trail del Marganai is laid out as a loop: start and finish are in the same place.
Yes. The Trail del Marganai course is on this page as a free GPX download — ready to import into Garmin, Wahoo, Komoot, Strava or any other app that reads GPX.
Preparation for Trail del Marganai should account for 100 km, 4,637 m of elevation gain, current training load, and available training time. An adaptive plan helps place key sessions without ignoring recovery and real life.
The pacing strategy for Trail del Marganai should reflect 100 km, 4,637 m of elevation gain, and your current fitness. Start controlled and keep margin for sections where the profile or fatigue makes target pace harder.
Trail del Marganai takes place on March 6, 2027.
Trail del Marganai takes place in Buggerru, Italy.
Trail del Marganai offers 4 distances — TDM 100K: 100 km; TDM 47K: 47 km; TDM 25K: 25 km; TDM 17K: 17 km.
Registration runs through the organiser: traildelmarganai.org. YOUB shows you the course, elevation profile and training plan for your preparation.