Sempacherseelauf: Course, Route Profile & Map

Course & Elevation

The start is on the Martigny-Platz in the centre of Sursee. The lap takes the north eastern shore first: Schenkon comes at kilometre two, Eich at kilometre six, and Sempach at the southern end of the lake at kilometre nine. From there you run the western shore back, past Nottwil at kilometre sixteen and Oberkirch at kilometre eighteen, until the finish returns to the Martigny-Platz. It is a closed loop with no net elevation change, and no stretch is covered twice.

There is no difficulty in the classic sense. About 86 per cent of the distance sits in the flat gradient band, the course moves between 501 and 517 metres above sea level, and the organiser describes the only structure it has as three very long drags of at most fifteen vertical metres. What matters more than the profile is the change of surface: the first 8.7 kilometres are 48 per cent asphalt at lane width, and after that the rest turns into a footpath along the lake shore.

Around it stands an evening race with the feel of a village festival. 2027 is the 16th running, staged by GO-ON Events GmbH of Sursee; in 2026 there were 2,651 entries and every distance except the children's runs was sold out weeks or months ahead. Feed stations sit at the Schenkon lido, in Eich, at the Seeland Sempach, at the Nottwil lakeside lido and in Oberkirch, with bananas and gels at Nottwil and Oberkirch. Pacemakers run 1:30, 1:40, 1:50, 2:00 and 2:10, the course closes at 21:00, and the food trucks on the Martigny-Platz open at 16:00 while the prize-giving is around 20:30.

Pacing Strategy

On a course without a climb nothing external sets the beat, and the Sempacherseelauf sharpens that: the first 8.7 kilometres are wide and asphalted, the field is large, and at 18:05 you feel fresh after a whole day of waiting. That is exactly where most races are lost. Run the first three kilometres deliberately slower than the surface allows.

The half marathon is decided between kilometre nine and sixteen, from the Seeland Sempach to Nottwil. From 8.7 kilometres the route becomes a narrow lakeside path, overtaking suddenly costs energy, the field has strung out and the scenery barely changes. If you have a group here, hold it; if you are alone, think in fixed blocks rather than watching your splits.

The two traps are the wind and the shape of the day. Lake Sempach lies open, the outward and return halves run along opposite shores, so one of them has a headwind, and you only find out which after the turn at Sempach. On top of that an evening start asks you to fuel across a whole day: eat as you would before a morning race and you will run the second half empty, and the noticeable cooling by the lake around 20:00 is not a side issue over the closing five kilometres.

Training plan for Sempacherseelauf: 12-week build

For a well trained age-group runner this half marathon takes roughly 75 to 150 minutes; the pacemakers cover 1:30 to 2:10 and the course closes at three hours. The demand is a continuous effort just under threshold, with no recovery on descents and no change of rhythm, because about 86 per cent of the lap sits in the flat band.

What decides the race is the section between kilometre nine and sixteen on the narrow lakeside path. It asks for no new skill, only for the ability to hold a pace with nothing external prompting you, and to do it on softer, less even ground than the first half of the course. Train that with long threshold blocks of two by twenty or three by fifteen minutes at race pace, and with a weekly long run of 18 to 24 kilometres whose second half is deliberately on unpaved path.

The second emphasis is the change of surface itself. A course that narrows from lane width to footpath width after 8.7 kilometres asks for sure footing and a stable foot at a point where you have already been running for forty minutes. Strides on unpaved ground, foot and calf strengthening, and at least one long session in your race shoes on mixed surfaces cover it.

Conditions are the most distinctive preparation task this race sets. An 18:05 start in early May means a full day of eating and waiting beforehand, a second half in fading light, and a lake shore that cools noticeably towards the end. Put at least three key sessions into the early evening over the final six weeks, rehearse there the full day of food you plan for race day, and decide in advance which layer you want with you for the last five kilometres by the water.