The first round was at Southland rodeo on Saturday. It is followed by another round last night at Outram and a third tomorrow.
Barrel racing champion Jen Atkinson, from Middlemarch, has been coaching the Kiwi competitors and also matching the Australians with horses.
Horses were all lent, which was very much appreciated, and it was about matching each competitor with a mount to give them the "best shot''.
"It's about the youth development and giving them some experience and enabling them to carry on through,'' Mrs Atkinson said.
Queensland twins Keeley and Peyton Sibson (15) were both competing in the barrel racing, having taken up the sport four years ago.
The sisters had "done a bit of pony club'', but wanted to do something more extreme.
Having watched their brothers compete at rodeos, they decided to take up the sport.
They hailed from a vast cattle property at Dysart and would return to boarding school when their trip was over.
Rodeo's appeal for Keeley was getting to be with friends at weekends, while Peyton added: "you get to go fast''.
Rodeos were a little different in Australia; they were usually held at night because of the heat, and it was also not unusual to drive eight or 12 hours to compete, they said.