The Rocky Mountains stretch 3,000 miles from northern Alberta and British Columbia in Canada, all the way to which state in the southern part of the US?

The Rocky Mountains stretch all the way to New Mexico in the southern part of the US.

The Rocky Mountains stretch all the way to the state of New Mexico in the southern part of the US.

To find out which state in the southern part of the US the Rocky Mountains stretch to, you can use a map or do a quick search online. The Rocky Mountains are a major mountain range that runs through multiple states in the US and extends into Canada. However, in the southern part of the US, the Rocky Mountains mainly stretch to the state of New Mexico.