Comet Pan-STARRS will be quite visible to the unaided eye through mid March.
It will be very low on the western horizon just after sunset.
Here's the trick to getting a good view: you can't have mountains to your west! So, for Tucsonans and Sierra Vistans, you'll need to head west of the mountains (Tucson Mountains and Huachuca Mountains).
The following charts make it super simple and clear where to see Pan-STARRS each night. These images are from Astropixels.com.