The only colonies who were predominantly English speaking at that time, in what is now "Canada", were Nova Scotia, St. John's Island (what is now Prince Edward Island), and Newfoundland. All of these colonies had a very small population. In the case of Nova Scotia, most of the population were recently arrived immigrants from New England.
There were Nova Scotians who were sympathetic to the rebellion. In fact, they even sent emissaries to meet with General Washington. However, there were a variety of factors that dissuaded serious American aggression in the province, and that prevented Nova Scotia from launching its own successful rebellion:
The colony was completely isolated by road to the 13 colonies further south, and transportation was largely coastal. This would prove a logistics nightmare for any support coming from the 13 colonies in an area patrolled by the Royal Navy.
Society was rather split - on the one hand most Nova Scotians were recently arrived New Englanders who sympathized with the rebel cause. On the other hand, most of these people were also merchants and fishermen who benefited greatly from trade with Britain and ship building contracts provided by the Royal Navy. Economically there wasn't quite as much of an incentive to rebel as there was in the southern colonies.
American privateers destroyed several fisheries which infuriated the local inhabitants. Particularly the raid on Canso, the battle of Ft. Cumberland, the Siege of St. John, and the Battle of Miramichi. This swung some support towards the loyalists.
Destructive raids in what is Prince Edward Island (Raid on Charlottetown) also steered local support in PEI towards the loyalist cause.
Newfoundland was rather isolated from the action, but it was largely in their interests to remain loyal to Britian. Particularly to benefit from the new fishing markets open in the Caribbean, from which the Americans were largely excluded from. Newfoundland was also completely isolated from the southern colonies. Even today, Newfoundland is rather culturally distinct in North America - only becoming a Canadian province almost two centuries after the American Revolution.
The area in what is now Ontario was very sparsely populated and was nominally part of Quebec. The francophone inhabitants of Quebec, in a strange twist of history, mostly decided to stay loyal to Britain. The reasons being:
The Quebec Act was very generous towards the landed establishment in Quebec society, protecting her language, customs and systems of land tenure. The Quebec Act was openly rejected by the American rebels, and as such, steered many Quebecois towards loyalism.
The invasions of Quebec failed early on in the war, and the British maintained a major military presence in what is now Quebec City.
Most Quebecois saw this war as a civil war between Englishmen, and not necessarily as a war concerning two belligerent nations. They were mostly interested in retaining their system of land tenure and religion - both nominally supported by Britain - so there was very little incentive for Frenchmen in Quebec to join what they saw was largely an English war.
Still, there were enough supporters in Quebec to form two Patriot regiments throughout the war. The 2nd Canadian Regiment was actually quite instrumental in the Battle of Yorktown, the Battle of Brandywine and the Battle of Germantown. In a strange twist, French colonists in North America found themselves allied with Britain, while English colonists in North america found themselves allied with France.