No, Las Vegas is not in the Rocky Mountain Time Zone. Las Vegas is located in the Pacific Time Zone (PT). This means that Las Vegas is 1 hour behind the Rocky Mountain Time Zone (MT). The Pacific Time Zone includes states like California, Washington, and Oregon, while the Rocky Mountain Time Zone covers states such as Colorado, Utah, and Wyoming. So, if it’s 12:00 PM in the Rocky Mountain Time Zone, it will be 11:00 AM in Las Vegas.