Polls will be open from 8:30 a.m.to 8:30 p.m. Newfoundland Time, Atlantic Time and Central Time; 9:30 a.m.to 9:30 p.m.
Speaking to supporters, Trudeau called on voters to unite behind the Liberals, particularly in his home province of Quebec, by raising the spectre of separatism should the Bloc Quebecois capture a large haul of seats.
The People's Party has situated itself to the right of the Conservatives and could draw votes away from the Tories.
It's voting day in Canada and the polls show the Conservatives and the Liberals are in a dead heat.
"I am a lifelong Liberal voter and I am stumped on this one, mostly because I am really concerned about a Conservative win and just trying to figure out how to vote strategically", said Kristin Street, 33, a strategy manager at a computer games company, in Port Moody, British Columbia. "We need to unite as a planet".
"The Bloc Quebecois came out and said its No. 1 priority is separation, is dividing the country once again - not even the fight against climate change, not even to stop Conservative cuts, but to revive old debates that we moved past", Trudeau said.
"We need to unite as citizens".
Trudeau's star has dimmed since winning a 2015 landslide that echoed the wave of support which in 1968 carried to power his flamboyant late father Pierre, who is considered the father of modern Canada.
Polls heading into Monday's vote suggest a deeply divided electorate after a campaign marked by revelations that Trudeau repeatedly wore blackface more than a decade ago; Scheer's dual citizenship with the United States and iffy credentials as an insurance broker; and questions about the federal role in a legal challenge to Quebec's secularism law, known as Bill 21, that is popular in the province but highly controversial.
His image has been tainted by ethics lapses in the handling of the bribery prosecution of an engineering giant, while his campaign was rocked by the emergence of old photographs of him in blackface make-up.
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He was joined by his wife Sophie Gregoire Trudeau and their three children.
Scheer, meanwhile, has struggled to convince voters to look past his boring, minivan-driving dad persona and the party's minimalist platform to give the rookie leader a chance to govern.
"Whatever it is, we know Trudeau would pay any price to stay in power and he'd use your money to do it".
It was a flawless move, said Quebec candidate Gerard Deltell, who is running for re-election this campaign after being one of the party's star recruits in the 2015 election.
Trudeau evoked the bogeymen of past and current Tory parties fostering "politics of fear and division" while Scheer called the prime minister a "compulsive liar", "a phony and a fraud".
"The system we use now is risky - it's not just bad, it's not just flawed - it's actually unsafe", May said.
"Now all the media is covering this now, that this was a dirty election and that people lied - the Conservatives lied about the Liberals, the Liberals lied about the Conservatives, the NDP continue to lie about the Greens".
In 24 hours, it will be up to Canadians - but until then, the leaders vying for votes are making one last plea for unity behind their parties after a divisive campaign.
Scheer was shaken late in the campaign over revelations of his U.S. dual citizenship and allegations that his party hired a communications firm to "destroy" the upstart People's Party, led by former Conservative foreign minister Maxime Bernier.