Recognized as one of Ireland's fastest 5km routes, the Rathfarnham 5k follows a net downhill course designed for high-speed performance. Starting on Springfield Avenue, the route traverses Dodder View Road and Rathfarnham Road to Terenure Cross before returning via Templeogue Road to finish near Rathfarnham Bridge. The profile includes a significant 1.3km downhill closing segment, making it a primary destination for runners targeting personal bests.