The Offaly 5k Series Birr (hosted by Birr AC) is a single-loop road race that starts and finishes near the town of Birr, often beginning on Syngefield Road. The course navigates a circuit on paved local roads, typically concluding near Birr Rugby Club. The terrain features an undulating profile, notably including a challenging incline for approximately 700m around the 3.5km mark, followed by a downhill section toward the finish line.