We're expected to have a white Christmas across the Bozeman area. The snow is expected to move in as early as this evening. We could see 3 - 6 inches in the Gallatin Valley and 6 - 9 inches up in the local mountains.

A Winter Weather Advisory will be in effect from Friday at 2 pm until noon on Christmas. If you're traveling the early you can leave for Christmas the better, as the mountain passes will be getting snow.

Here's the official forecast from the National Weather Service:

The National Weather Service in Great Falls has issued a Winter
Weather Advisory for periods of light to moderate snow... which is
in effect from 2 PM this afternoon to noon MST Sunday.

* Locations... Big Hole Pass... Chief Joseph Pass... Dillon... 
  Monida Pass... Ennis... Norris Hill... Raynolds Pass... Twin 
  Bridges...  Battle Ridge Pass... Bozeman... Bozeman Pass... 
  Targhee Pass... West Yellowstone.

* Timing... snow will begin to fall across southern Montana late
  this afternoon and continue for tonight. Impacts will initially
  be mainly at pass level and higher through tonight. Widespread
  snow... moderate at times... will then be possible at all levels
  Saturday into Christmas day. Snow then tapers off Sunday

* Snow accumulations... 1 to 4 inches through Saturday
  morning... with more snow expected Saturday into Sunday. Total
  snow accumulations of 3 to 6 inches in the valleys and in the
  mountains 6 to 9 inches are expected.

* Winds... east 10 to 20 mph with gusts up to 30 mph.

* Temperatures... 7 to 29 above.

* Impacts... snow may make for difficult travel conditions and
  slick roads at times today through tonight... mainly at pass
  level. Saturday into Sunday will see widespread snow causing
  more hazardous driving conditions... and reduced visibilities in
  areas of snow and blowing snow. Snow and wind could also
  increase avalanche danger for those with back country plans.