This document summarizes observations of post-hibernation movements of four reptile species - Hierophis viridiflavus, Natrix natrix, Vipera aspis, and Lacerta bilineata - around a hibernaculum in western France between late March and late May. Most sightings occurred in April, gradually declining later that month, with no reptiles seen after May 28th. The reptiles remained close to the hibernaculum for approximately 45 days before dispersing. Movement patterns and areas used were analyzed and discussed in relation to habitat characteristics and previous studies.