Hosking was born in Bendigo, Victoria, and moved to the suburb of Campbell in the Australian Capital Territory.

[5] As a child she played field hockey and did rock climbing at a national level, however following an injury she asked her father, a keen cyclist, to help get her into cycling.

[6] Outside of cycling Hosking is a student, having completed a Bachelor of Communications degree at Griffith University specialising in journalism.

[7][10] Shortly afterwards, she was the first Team HTC–Columbia Women rider to win a 2010 event, with a victory at the Australian National Criterium Championships.

[10] At the 2010 Commonwealth Games in Delhi, India, Hosking won the bronze medal in the Women's road race.

[5] It was revealed after the event that the Australian team of six riders was under orders to ride for a victory for Hosking in the 112-kilometre (70-mile) event in preference to veteran Australian cyclist Rochelle Gilmore, however in the final sprint for the line Gilmore came out with the gold medal ahead of English rider Lizzie Armitstead in second, leaving Hosking in third.