The Josas Fireflies
Île-de-France · Saturday, December 5, 2026
The The Josas Fireflies is a course à pied (running) and trail (trail running) event held on Saturday, December 5, 2026.
- Date
- Saturday, December 5, 2026
- Location
- Yvelines, IDF
France
OpenStreetMap Google Maps
We hope you have been good this year because Santa 🎅 won't be far from chasing you on the trails of the Josas Fireflies before his big annual tour... 🎁 It's in December, during the Christmas market of Jouy-en-Josas that you'll start this night race 🌙 promising you an extraordinary experience. The Josas Fireflies is the race where fireflies compete with shooting stars 💫. Whether you choose the trail of 8 km or 12 km, you'll run lighting up the gentle forest landscape of the Yvelines, so make sure to choose your costume wisely to shine brightly! 💡 Yes little firefly, to shine there's nothing better than neon! The dress code is stabilo 🖍️. At least, you won't get lost in the dark! 😉