It took place from 28 April to 3 May and was the fourteenth race of the 2015 UCI World Tour.

[1][2] The race took place around the Romandy region of Switzerland, starting in Lac de Joux and finishing in Lausanne.

The defending champion was Chris Froome (Team Sky), who won both the 2013 and 2014 editions.

He had shown good form early in the season by beating Alberto Contador at the Vuelta a Andalucía, but afterwards fell ill.

[9] The other principal favourites ahead of the race were Nairo Quintana (Movistar Team), who had won Tirreno–Adriatico earlier in the season, and Vincenzo Nibali (Astana), the reigning Tour de France champion.

[5] Quintana had recently finished in fourth place in the Tour of the Basque Country and was seen as a particular threat in the mountains.

[9] Nibali, meanwhile, had ridden aggressively in the Ardennes classics but had not won a race since the previous July; L'Équipe described him as "in search of a convincing result in 2015".

[9][10] Other favourites included Nibali's teammate Jakob Fuglsang, Simon Špilak (Team Katusha), Rigoberto Urán (Etixx–Quick-Step), Rui Costa (Lampre–Merida), Thibaut Pinot (FDJ), Simon Yates (Orica–GreenEDGE) and Mathias Frank (IAM Cycling).

[13] The start line was at the south-western end of the Lac de Joux in Le Sentier; the riders first headed south-west for about 2.5 kilometres (1.6 miles), then turned north-east.

The course to this point had been generally flat, but the last 3 kilometres (1.9 miles) of the course included the climb of the Col du Mont d'Orzeires and the descent to the finish line in the Juraparc de Vallorbe.

Geraint Thomas was the first rider across the line and so was the first leader of the race; he had previously worn the yellow jersey in the 2012 Tour de Romandie.

The general classification was calculated by adding up each cyclist's finishing times on each stage.

Over the road stages of the race, there were 15 classified climbs, each of which was ranked as first-category, second-category or third-category.

The first riders to cross the summit of the climbs won points towards the mountain classification.