Jarc was born in the town of Novo Mesto, but spent most of his youth in the nearby Lower Carniolan village of Prečna, where his parents worked as farmers.
In 1993, Jarc shortly moved to Brussels and got employed as an advisor to the European Commission, in the General Directorate for the Policy on Small and Medium Enterprises.
Following the victory of the centre-left coalition led by Borut Pahor, Jarc was replaced as Minister of Agriculture by Milan Pogačnik.
In December 2008, after several months of delay, he was appointed by President Danilo Türk as ambassador to the United Kingdom.
Since December 2008, Jarc is the president of the Committee for Agriculture in the Expert Council of the Slovenian Democratic Party, the current shadow cabinet in Slovenia.