Grape Picking in Australia is a big business and wine is one of the biggest agricultural products in the country.
There are many different regions that produce wine and at harvest they need a large casual workforce to pick the harvest.
When the harvest takes place is determined by the weather but I have provided an time frame of when the harvest begins.
Here are the best regions to find Grape Picking work by state
Barossa Valley – harvest Feb – Mar
Fleureau Peninsula – harvest Feb – Mar
Clare Valley – harvest Feb – Mar
Coonawarra – harvest Feb – Mar
The harvest can last up to 2-3 months depending on the yield.
Mornington Peninsula harvest Feb -Mar
Mildura/Robinvale Table Grapes and Wine Grapes Late Dec to Feb
Yarra Valley harvest Feb – Mar
Rutherglen – harvest Feb – Mar
New South Wales
Hunter Valley – harvest Jan/Feb
Griffith/Leeton harvest Feb/Mar
Margaret River – harvest Jan
Swan Valley – harvest Jan
Tamar Valley – harvest Feb-Mar
Stanhope – harvest Feb/Mar
So you can see that the harvest times for grapes around Australia are pretty much the same time but if you wanted to pencil in January through to March you should be able to find grape picking work in all the southern states. South Australia might be your best bet because of how much work there is to be done. and consequently you should be able to get a longer period of work. If there was an early harvest in Hunter Valley and a late harvest in South Australia you might be able to do this back to back.