Cross country trials are held in early September on the school's new track. Four teams are selected which consist of six members. There is a boys and girls team from third and fourth classes and a boys and girls team from fifth and sixth classes.
Those who make the team participate individually and as part of a team in a west Mayo competition held in Ballyvary each year. If they are successful in qualifying as an individual or as a team they go on to the Mayo competition held in Beelick Woods, Ballina. Once again if the children are successful they qualify to the Connaught competition held in Calry, Sligo.
In the past St.Peter's N.S has been very successful in all competions with silverware for both individuals and teams at provencial level.