The regional music festival rocked the University of Canberra fields to a sold out crowd, returning to Canberra for the eighth time.

Tickets sold out quickly in early February thanks to a lineup that included Amy Shark, The Wombats, Dillon Francis, Pnau, Milky Chance, The Darkness, Snakehips, Tash Sultana and Violent Soho.

Huge crowds meant lengthy queues to enter in the early afternoon. A Sydney woman, who gave her name only as Michelle, said they were frustrated by delays to get in.

"We've been in the line quite a while," she said.

"There were some good [bands] earlier on in the day that we could we seen, but we missed."

Inside the gates, despite a maximum of only 15 degrees, there were plenty of bare limbs on display.

Glitter, fishnets, overalls and denim were in, while pants were apparently out of fashion, with a lot of backsides on full display.

Right on trend wearing a leotard bottom and sheer lace skirt, Cass England said she chose the pants-less look because it was on trend, and "warmer than shorts".

"I'm warm in the sun, but I packed jeans and a jumper in my bag," she said.

Her friend, Maddi Lee, was covered in the other big trend of the day - glitter. She said there was more to it than just slapping some on.

"You have to put on paw paw cream to make it stick on and lots of hairspray to set it," she said.

Lee and England, both from Newcastle, chose to come to the Canberra event as opposed to the festival in their neighbouring Maitland.

"[Canberra is] heaps better - everyone is so much more chilled - they're here for the music," England said.

For the first time this year, every show in the Groovin The Moo tour sold out, which included festivals in Bunbury, Maitland and Townsville.

A video posted on social media showed more than a dozen people jump the fence to get into the event, although security guards were later seen checking armbands and removing people who had not paid to enter.

ACT Policing confirmed it was responding to the fence jumping incidents at the Groovin the Moo festival.

"Fence jumping at the event may be subject to criminal prosecution for trespass which is punishable by a fine of up to $1400," a spokeswoman said.

Alison Noble, who grew up in Canberra but now lives in Sydney, was drawn to the festival by the lineup - in particular, The Darkness.

She said coming to a music festival in Canberra was, "so much easier".

"And it's so good that Canberrans are getting these acts and for local people it's on their doorstop. For Canberra people you don't usually get that - you have to travel," she said.