Quebec in the winter is all crisp air, historic cobblestone streets buried in snow, and some of the best skiing in the east at places like Mont-Tremblant and Le Massif. You want to book your lodging well before the first snow falls, because the best chalets near the lifts go fast and prices jump once ski season hits.
A typical trip runs about $1500 for lodging, lift tickets, and getting around. Dropping that much cash right before the holidays hurts, so it helps to spread out the payments over a few months instead of taking the hit all at once.
That intro window is a hard deadline, not free money. If you still have a balance left on the card when the 15 months are up, interest kicks in on whatever is left over.