Organisers predicted up to 8000 runners pounded the pavement on the capital's northside for the Swisse Color Run on Sunday morning.

It was the second year the paint race, dubbed the "happiest five kilometres on the planet", has been held in Canberra.

Huge crowds made their way in a loop from Commonwealth Park while bombarded by 3000 kilograms of vibrantly coloured corn starch.

The run was followed by a party at the finish line where more coloured starch will be thrown into the air.

Race director Woody Sedgman said the event took around six months to organised including coordination with the National Capital Authority, staff and various contractors.

"This event has proved so successful because it's just a simple and fun idea," he said.

"It's about putting people in a position where it is not about competition but having fun and the colour element helps take people's inhibitions away – it makes sure they have a good time.

"It's about getting a good selfie and being funny with your friends and bringing out your inner child."

It seemed many Canberrans had such a good time they refused to clean themselves and proudly wore their coloured starch around town in the afternoon.

Since the first event in the United States in 2012, the Colour Run has become a worldwide phenomenon and been held in cities in Europe, Africa, Asia and Latin America.

The event takes place all over Australia, with runs also scheduled for Melbourne, Queensland, Perth and Adelaide in coming months.

Mr Sedgman thanked everyone involved in the event and said the organisers would continue help Canberrans "enjoy the moment".