The leaders of the NDP and Liberals are setting their sights on British Columbia today, while Stephen Harper focuses on Conservative territory in southwestern Ontario.

Liberal Leader Justin Trudeau starts his day with an announcement in Winnipeg, followed by another announcement in Vancouver.

There, he'll find himself in the same region as NDP Leader Tom Mulcair, as he makes an announcement then holds a roundtable discussion in nearby Surrey.

Surrey, seen as a key battleground for all three main parties, has four main ridings, two controlled by the NDP and two held by the Conservatives.

Harper will make a mid-morning announcement in London, Ont., where Conservatives hold three out of the four seats.

The Tories solidly took two of the ridings in the last election, while the NDP garnered 50 per cent of the vote in London-Fanshawe, but London North Centre only turned Conservative in 2011 and not by a large margin.

Bloc Québécois Leader Gilles Duceppe will hold a news conference at safe injection sites in Montreal while Green party Leader Elizabeth May will greet commuters during an early morning visit to Saanich, B.C.

Details list of the leaders' itineraries Tuesday

(Times are local)

Conservative Leader Stephen Harper

London, Ont.: Makes an announcement. 9:30 a.m. at Lamplighter Inn & Conference Centre, 591 Wellington Rd.

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NDP Leader Tom Mulcair

Surrey, B.C.: Makes an announcement and holds a media availability. 10:45 a.m. at Comfort Inn, 8255 166 St.

Surrey, B.C.: Holds a roundtable. 2 p.m. at Aria Banquet Hall and Convention Centre, 12350 Pattullo Pl.

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Liberal Leader Justin Trudeau

Winnipeg: Makes an announcement. 8 a.m. at Holiday Inn Winnipeg South, 1330 Pembina Hwy.

Vancouver: Makes an announcement. 1 p.m. at Le Centre culturel francophone de Vancouver, 1551 7th Avenue W.

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Green Party Leader Elizabeth May

Saanich, B.C.: Greets commuters. 7:30 a.m. at Quadra Street and McKenzie Avenue.

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Bloc Québécois Leader Gilles Duceppe

Montreal: News conference on safe injection sites. 11:15 a.m, photo op at 11:45 a.m., Marche Maisonneuve, 4445 rue Ontario Est.

Longueuil, Que.: Introduces candidates. 6:50 p.m., Restaurant Quai 99, 99 chemin de la Rive.

View a map of the leaders' movements so far, including in the months leading up to the campaign.

With files from CBC News