In 1945 after World War II, the engineer Bozzola, with the help of some leaders reconstituted the company under the name Associazione Calcio Borgosesia.

In 1952 the Borgosesia gained promotion to Division IV, the current Serie D. Coach of the team was Frederick Munerati.

In 1968, after a tight battle with Suno, the Borgosesia played eight seasons in Serie D: the technicians of this streak were Tarabbia, Giancarlo Amadeo, Donna and Sturaro.

In 1990 began a new era for the team, chaired by Mario Majolo and led by young technician Gianmario Arrondini, the transition from the conquered Prima Categoria to Promozione.

It won this championship, which at the end of the season Campionato Nazionale Dilettanti, Borgosesia reached the prime of its history, with the first promotion in Serie C2.