On July 2, 2016 Tim Dearden completed a FKT of the round trip Mt Adams Climb, South Climb Route. The start and finish was at the Cold Springs Trail Head #183. He completed the ascent and descent in 3:55:50. I am unable to find a faster round trip to the summit of Mt Adams via the South Climb Route. The ascent was completed in 2:43:52. Below is GPS proof of the climb and descent.