Here's how much faith to put in forecasts...
1-3 days out -
High level of confidence. Might not be nailed, but there won't be any huge misses.
4-5 days out -
Mid-level confidence. Likely not to see any HUGE changes, but the system dynamics and specific impacts can be adjusted (ie. a storm's track could shift enough to limit impacts).
6-7 days out -
Low confidence. Overall trends are in place with regards to temperatures, and high and low pressure systems, but specifics are impossible to nail this far out and WILL be adjusted as the forecast moves to 4-5 days out.
8-10 days out -
Extremely low confidence. Temperature trends can be evident, but beyond that, I would not lend much credence to the fact that one long-range forecast model predicts rain at 10-days out.
Also, keep in mind that the Weather.com forecast for Bozeman is not going to be the same as the forecast for on-mountain at higher elevation.