The results of almost 150,000 electronic pre-poll ballots will quickly be known as they are entered into the system shortly after 6pm on Saturday, meaning voters will have a fair idea of which candidates will be successful within the first few hours.
In almost a decade in charge of the nation's capital, Mr Barr has a laundry list of achievements to point to, including a popular light rail line, introducing voluntary assisted dying and free pre-school.
But some Canberrans feel it's time for renewal in the Legislative Assembly after 23 years of Labor rule.
Labor Chief Minister Andrew Barr still commands strong support among ACT voters. (Mick Tsikas/AAP PHOTOS)
Elizabeth Lee, a moderate, has reinvigorated the Liberals after their many years wandering the wilderness in Australia's most progressive jurisdiction.
She hopes to capitalise on frustration among homeowners, who have seen residential rates grow substantially since the government moved to abolish stamp duty in 2012, by setting a 2.2 per cent cap on rate increases.
However, with big spending promises like a new stadium in the centre of town, and no new taxes, she has come under fire for her policy costings.
Given the ACT's left-leaning nature, Ms Lee acknowledged it would be an uphill battle for the Liberals to win their first election since 1998.
"But I'm very hopeful. We've been listening to the concerns of Canberrans, and I think that when you have a look at our policy platform for this campaign, it's clear that we have taken on board the issues that matter," she said.
Elizabeth Lee is hoping to lead the Liberals back to power in the ACT. (Mick Tsikas/AAP PHOTOS)
The Greens, meanwhile, are looking to build on the record six seats they won in 2020.
Their leader, Shane Rattenbury, has been a cabinet minister since 2012 and an integral part of the Labor-led coalition government.
"There's obviously always a risk for the smaller party in any two-party government," he said.
"If it goes well, the big party gets the credit, and if there's concerns, often the smaller party does get to wear the consequences of that. So we'll see how we go today."
Disillusioned by the major parties, voters Lachlan Peele and Bea Osborne were more enthused by the baked goods on offer at Ainslie North Primary School in Mr Barr's electorate of Kurrajong.
"If I could give my vote to these honey joys, I would," Mr Peele told AAP.
They said their votes would be going to the Greens, whose "vibe" they felt aligned more with their personal values.
Sweet treats held the most appeal for voters Lachlan Peele and Bea Osborne. (Jacob Shteyman/AAP PHOTOS)
Mr Barr is almost certain to be re-elected in the central Canberra electorate, alongside Ms Lee and Mr Rattenbury.
Health Minister Rachel Stephen-Smith is also a strong chance at re-election for Labor.
But there is likely to be a tight battle for the electorate's crucial fifth seat, with Greens incumbent Rebecca Vassarotti needing to head off a determined challenge from the Liberals and David Pocock-backed independent Thomas Emerson.
It's a similar situation across the ACT's five electorates.
As Labor and the Liberals are usually sure of at least two seats in each electorate, those final "hinge" seats will ultimately determine who will control the government.
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