Courfaivre sits in the French-speaking canton of Jura, so standard French is understood everywhere — from the village center to PostAuto bus stops and trailheads. Swiss politeness norms apply: greetings (Bonjour/Bonsoir), merci, and s'il vous plaît open every interaction, and switching to a more formal vous is appreciated with older residents, shop staff, and hikers you don't know.
Because Courfaivre is small, most practical services live in nearby Delémont: the train station, larger restaurants, pharmacies, and the regional hospital. A short set of transit, dining, trail, and emergency phrases will cover almost every visitor moment in and around the village.