They share a common border.
689 miles
If you are driving or flying to Colorado or Utah from California, Colorado is farther away.
Colorado is east of Utah.
Colorado's western border is shared with Utah.
It is 355 miles according to Google Maps.
It is 630 miles according to Google Maps.
Lakewood, Colorado and West Valley City, Utah are 371.81 miles (598.36 kilometers) apart
California to Colorado, obviously!
No, it's in Colorado.
California to Colorado is further than California to Utah.
Colorado lies east of Utah. Utah lies to the north-east of California. Therefore, Colorado is farther from California. See the link for a map.