We know nothing of Horizon Zero Dawn so far other than the fact that it has a female protagonist and is supposed to have robotic dinosaurs. The trailer that was shown for the game at E3 2015 was incredibly stunning and showed gameplay too.
Thanks to a Redditor named Michael_Armbrust, we may have a clue that the game is actually set in Colorado, United States. Actually, the image comparison below makes it certain that it has to be set in Colorado.
The game does not have a release date yet and is expected to be released later this year. However, there was a rumour recently that the game could be delayed and pushed to 2017, which we hope isn’t true.