There's always more to be said but in the meantime, you can find some answers in this thread by u/enygma9753.

While the Patriots did find sympathizers in both Quebec and the Maritime colonies, there wasn't the groundswell of popular support for rebellion as in the Thirteen Colonies.

The Continental Congress had sent an invitation to Quebec to join the revolution in 1774, but they were rebuffed. The Quebec Act, passed that year, granted the Quebecois (or 'Canadians' as they were called then) language, religion and property rights. They could not be certain that they would get a better deal with the Americans -- who they trusted even less than the British. Benjamin Franklin was sent to Montreal with a printing press, with plans to start a pro-Patriot newspaper (which exists today as the Montreal Gazette!). The rebels failed to gain significant traction with the local population, although there were local agitators who did manage to recruit units of Canadians.

The Patriots exaggerated the size of the numbers recruited in Canada when they sent updates to the Boston papers, claiming they had upwards of 2,500 Canadian recruits. In reality, the total American force attempting to besiege the fortress at Quebec City numbered about 900 fit to serve. The invasion force had already lost men to sickness and disease during their arduous journey north. While they were successful in initially capturing Montreal, a smallpox outbreak ripped through the ranks. Another problem was that the enlisted ranks were only part-time and were to be released from service by year's end. All of this, combined with a brutally cold winter storm, would doom the invasion of Quebec.

The Maritime colonies were sparsely populated in comparison to America, with more rugged terrain. Local Patriot sympathizers found it more difficult to coordinate activities in the region. Nova Scotia, the nearest to New England and most populous of the Maritime colonies, had many recent settlers from New England and had potential as the "14th" colony. But they were less interested in political intrigue and more interested in carrying out their livelihoods in peace. They would be known as the "neutral Yankees" of Nova Scotia. A brief uprising led by a member of the NS Assembly was crushed, followed by the razing of Patriot villages and the arrest or exile of sympathizers. American coastal privateering raids also turned the local populace against the Patriot cause, while the presence of the Royal Navy in Halifax and a staunchly Loyalist assembly ensured that Nova Scotia stayed true to the Crown during the revolution. Again, the Patriots exaggerated the level of support among the locals when they sought aid from the Continental Congress, which saw rebellion in NS as less than promising.