The 45th annual Shamrock Shuffle in Chicago commenced with thousands of runners braving cool temperatures to inaugurate the city's spring running season. Participants congregated in Grant Park and throughout downtown Chicago for the event, which unfolded with temperatures hovering around 39°F (4°C). The brisk weather introduced an additional layer of challenge for participants, yet the atmosphere remained spirited as athletes and casual runners alike celebrated the advent of spring with this traditional event.