As of my last update in January 2022, there are five movies in the Ice Age franchise:
1. Ice Age (2002)
2. Ice Age: The Meltdown (2006)
3. Ice Age: Dawn of the Dinosaurs (2009)
4. Ice Age: Continental Drift (2012)
5. Ice Age: Collision Course (2016)
These are the main films in the franchise. Additionally, there are several short films and specials associated with the series.