The Exploratorium writes:
The comet Pan-STARRS is currently in view! Did you glimpse it last night?
This beautiful photo was taken by Exploratorium Staff member Adam Esposito last night (March 12) from the Berkeley Hills with a telephoto lens. Uranus is actually right near the comet as well. Mars in the clouds below.
TO VIEW TONIGHT: most of USA and northern hemisphere should look west, about 30 minutes after sunset. You may be able to see it below the crescent moon. It’s close to the sun so only after sunset is it briefly visible in the darkening sky.
We were able to see it last night with a Galileoscope, in spite of haze and an aggressive tree-line, by locating the moon and panning left. SpaceWeather.com has a helpful sky map, too.