Do I need a passport to cross into Canada at Niagara Falls?

Yes, you absolutely need a passport to cross into Canada at Niagara Falls. There is no way around it for U.S. citizens—no driver's license or birth certificate will cut it at the border. If you're flying in from another country, same deal: a valid passport is required. The border is staffed 24/7 by Canadian officials, and they do not mess around. If you forget it, you're stuck on the U.S. side looking at the falls from a distance.

The only exception is if you have a NEXUS card or an enhanced driver's license (EDL) from specific states like New York, Michigan, or Washington. But for 99% of tourists, just bring your passport. Also, if you're bringing kids under 16, they can sometimes cross with just a birth certificate if they're with a parent, but honestly, get them a passport too—it's less hassle. Don't try to wing it; you'll waste your trip.