No, it isn’t.

Via Breitbart:

Boulder, Colorado is rushing to formalize its status as a sanctuary city in the weeks leading up to the inauguration of President-Elect Donald Trump.
“That seems to be a meaningful goal post to shoot for,” Mayor Suzanne Jones told Boulder’s Daily Camera newspaper.

“A great way to start the new year.”

The local news outlet reported the move is largely symbolic as Boulder already follows the policies of other jurisdictions classified as “sanctuary” jurisdictions. The decision appears to be an “in your face” move in response to the incoming president’s threat to defund similar cities.