The start line for Trail la Rigol'Hard is in Billy-Berclau, Pas-de-Calais, northern France, facing the church. This short trail-running event takes place in early April, organized by the Jogging Club de Billy-Berclau. The race distances are designed for local trail runners, not ultra specialists, with options of 8 km, 16 km, and occasionally up to 24 km.
The courses traverse Parc Marcel Cabiddu and the green areas near Wingles, Douvrin, and Billy-Berclau. The 16 km course features approximately 150 m of elevation gain, offering rolling park and trail running rather than mountainous terrain. Aid stations and changing rooms are provided. Both the 8 km and 16 km races have attracted over 100 participants in previous years.