He was elected joint spokesperson for the Green Party in 2011, serving with Åsa Romson from 2011 to 2016 and then with Isabella Lövin from 2016 to 2019. When the Green Party entered the cabinet of Stefan Löfven in 2014, the Green Partys first–time ever government participating, he was appointed Minister for Education. As Minister for Education, he appointed the 2015 School Commission, took actions to safe-guard necessary knowledge in reading, writing and mathematics and introduced a programme (Lärarlönelyftet) designed to increase teacher's salary. He stepped down as Minister for Education in January 2019 and as Green Party spokesperson in May 2019.
Fridolin first served as a member of the Swedish parliament between 2002 and 2006, representing the Stockholm Municipality constituency.[1] Aged nineteen at the time, he was the youngest MP in Swedish history until 2010, when Anton Abele, a Moderate, set a new record.[5] During his first term in parliament he served as a member of the Committee on the Constitution.[1] Fridolin also served as a member of the board of the Green Party between 2004 and 2006, and was one of his party's representatives in the negotiations with the Social Democraticgovernment and the Left Party.[6]
In 2005 Fridolin announced that he would not be up for re-election as an MP in the 2006 election.[7]
Fridolin has written three books, all on politics. The first, titled Från Vittsjö till världen - om global apartheid och alla vi som vill någon annanstans (From Vittsjö to the world - about global apartheid and everyone of us that want to go somewhere), was released in 2006. His second book, titled Blåsta, was released in 2009, and his third book, Maskiner och människor - en skrift om arbete och framtidstro (Machines and men - writings on labour and belief in the future) was released in 2011. Machines and men was cowritten with Ulf Bodach Söderström and lays out a possible policy for an environmentally friendly industry.
Gustav Fridolin married Jennie Fridolin 2007;[8] they have two children.[9] They divorced in 2019.[10] He is married to Green Party politician Maria Ferm since July 2023.[11]
His political idols, aside from proponents of Green politics, include Liberal Prime Minister Karl Staaff of the early 20th century which he praised in a January 2011 article, espousing centrist and social liberal views.[12]
In 2014 he became the Minister for Education in the Löfven Cabinet, a position which he served until 2019 when he was replaced by Anna Ekström of the Social Democrats.