Hi Angela, 

You're right, this post was written in 2016, but it's still relevant because it is mostly an explainer on how (i.e. through what atmospheric processes) La Niña tends to affect U.S. winter climate in general.  But we have another post that is even more relevant to your question: 

https://www.climate.gov/news-features/blogs/enso/what-about-snow-during…

Although all events are somewhat different, on average, La Niña is good for snow in Northern CO, so if we see a typical La Niña, it should be good for fires in the northern mountains of the state.