The Greens hope to ride the momentum of their historic Northcote by-election win to grow their influence in Victoria even further in next year's poll.
Lidia Thorpe became the first Aboriginal woman to be elected to Victorian parliament after the Greens took the inner-Melbourne seat from Labor on Saturday night.
The win followed a swing of more than 10 per cent against Labor, who had held Northcote since the seat was created in 1927.
Victorian Greens Leader Samantha Ratnam says it sets the party up for a big run at next year's state election, pledging to contest five lower house seats.
"We've had an incredible result overnight," she told reporters in Melbourne on Sunday.
"(It) has created huge momentum for our 2018 state election campaign.
"We will be campaigning to win the seats of Brunswick and Richmond, retaining the seats of Melbourne, Prahran and Northcote, and retaining all our upper house representation."
Ms Ratnam says the result in Northcote shows more Melburnians, and Australians, are getting behind the "progressive" ideas of the Greens.
"We've seen the Coalition become more right wing and extreme over the last few years across this country," she said.
"We've seen a lot of disenchantment with politics and people don't like what they see.
"But they do like what they see when Greens campaign in seats like this."
The Greens now hold three seats in Victoria's lower house, along with five in the upper house.
MP-elect Ms Thorpe says her priorities in parliament will include schools funding, the proposed Great Forest National Park and getting rid of "dodgy deals" in politics.
"We need to stop the gambling donations and the developer donations," she said.
"I just can't wait to get started."
The Liberal Party didn't contest the Northcote seat and Opposition Leader Matthew Guy called the result a "complete smashing".
He says the heavy swing against Labor stemmed from Victorians seeing their leader as a "thug".
"The Premier Daniel Andrews is a bully and a thug, and voters have realised this," Mr Guy told reporters.
Police Minister Lisa Neville says the loss was "extremely disappointing" and congratulated Ms Thorpe, adding the result showed the party must "tell the story" of the importance of a Labor government.
"It's Labor governments that stand up for the services and supports the community needs," Ms Neville said.
The by-election was triggered by the death in August of Labor's Fiona Richardson from cancer.
