Hardaker entered the 2010 mayoral contest as a political newcomer,[1] one of six candidates.[17] Her main opponent was the experienced politician Bob Simcock, the incumbent Mayor, who has been on Hamilton City Council for 6 years.[1] He had been appointed Mayor in 2007 following the resignation of his predecessor,[18] and had represented Hamilton West in Parliament from 1996[19] until his defeat in 2002.[20]
Hardaker campaigned for opening the books on the V8s, transparent government,[21] city living and making the Waikato River accessible.
Of the 33,000 votes cast Hardaker and Simcock received 13,626 and 12,670, respectively, a majority of 956 votes and representing about 41% for Hardaker.[1][17][22] A year into her reign, an opinion poll by the Waikato Times showed an almost unchanged level of support, with 40% of the respondents stating they would vote for her again if an election were held tomorrow.[22]
She stood for re-election in the 2013 mayoral election.[23] Her manifesto for her second term was managing finances, implementing the Waikato River Plan and investing in the city.[24]
She was re-elected with 15737 votes over rival Ewan Wilson with 12826 votes, a 2911 majority which was a three-fold majority increase from 2010[25] and the first Mayor in Hamilton to be re-elected since Margaret Evans in 1995.
In March 2016 Hardaker announced that she would not be contesting the 2016 mayoral election and would be returning to her law career.[26]
Hardaker described her greatest challenge during her term as Mayor as opening the books on the financial status of the V8 Super Car Racing, a major event which was entered into by the previous Council. Her leadership and resolve during the process, which included establishing a City financial recovery plan moving the Council out of a 9-year run of operating deficits, received accolades from across the political spectrum.[27] In 2010 City debt was $422 million and forecast to increase to $830 million. By 2016 the council was running operating surpluses and debt had reduced to $348 million.[27]
Hardaker listed other Mayoral legacies as the Central City Transformation Plan, Hamilton Gardens and Hamilton City River Plan which is a 30-year visionary document containing a mix of short and long-term projects along 16 km of the Waikato River that would transform the city's relationship with the river.[27] During her term the Hamilton Gardens won "World Garden of the Year" at the International Garden Tourism Awards in Metz, France.[28]
Her performance as Mayor was graded an "A" having delivered on election promises through a combination of hard work, intelligence and unwavering self-belief.[29]
At Hardaker's final Council meeting the City presented to her a new garden rose breed called 'Julie Marguerite' which is now grown at the Hamilton Gardens.[3][30]