What time do they light up Niagara Falls?

The falls are lit up every night starting at sunset, but the exact time changes daily. Since you're asking, the lights come on about 30 minutes after sunset, so check a local sunset app for that day. In summer, that's around 8:30-9 PM; in winter, it's closer to 5-5:30 PM. The lights stay on until 10 PM in summer and 9 PM in winter, with extended hours on holidays like New Year's Eve.

If you want the full show, don't just stand there looking at static lights. The real deal is the "Illumination" sequence that cycles through colors every 15 minutes or so. Also, firework shows are seasonal—usually Fridays and Sundays at 10 PM in summer and some holidays. Skip the overpriced "Illumination Tower" tour; just walk along the Niagara Parkway or stand at Table Rock for the best free view.