The Three Peaks Trial is an organised challenge walk arranged each year in March by the Cardiff Outdoor Group. Since 2010 Longtown Mountain Rescue Team provide support with marshalls on all the mountain top checkpoints.

The Walk was first held in March 1963 and was designed for less experienced walkers who wanted to test their powers of endurance and skill at map reading. It is now the oldest challenge walk in the UK.

Over the years the event has been modified so as of 2014 there is a choice of four routes.