If the snow doesn't arrive around Algonquin Park, head a little further north to the Kirkland Lake area. You can do the Cochrane, Timmins tour from KL. If you want to add miles, travel up to Kapuskasing.
Pulled from OFSC publiction:
Ontario’s Wilderness Region Snowmobile Tours
For information on all District 14 tours: 1-888-828-2766 or
For information on all District 15 tours: 1-877-287-2457 or
Abitibi Canyon Tour (D15) - 459 km/285 mi.
Key Ontario’s Wilderness Region communities are: Cochrane,
Smooth Rock Falls
The Big Loop (D14/15) - 1,750 km/1,087 mi.
Key Ontario’s Wilderness Region communities are: Temiskaming
Shores, Gowganda, Timmins, Chapleau, Hornepayne,
Kapuskasing, Iroquois Falls.