Yes, Boise is considered one of our main rivals. But in terms of long standing rivalries Fresno has other schools that are more historical rivals like San Jose State, San Diego State, Hawaii. Fresno began playing schools like San Jose and San Diego in the 1920s, and did not start mixing it up with Boise as an FCS school until the 1990s. Boise was a jr college until 1974 when it became Boise State University. Many Fresno fans resent/hate Boise because they have dominated Fresno many times in the past and because of the success they have achieved. I personally consider SDSU to be our strongest divisional rival and Boise to be our strongest MWC rival at present. And many pundits expect Boise and Fresno to meet up again in the MWC championship game for the third consecutive time this year. Fresno had the better time in 2018, and Boise had the better team in 2017.
Boise has a very good team again this year with most of their returners coming back. Fresno is going through a rebuilding year this year with a new QB, new O line, new WRs, new LB unit, etc. But the team is well coached by Jeff Tedford. I know some opposing fans think that is a little overblown because they hear it so much from Fresno fans. But he has advised many great coaches on offensive schemes, QB development/play, etc. in the past, like Coach Chris Petersen, at UW, Nick Saban, Alabama and Urban Meyer, formerly of Florida/Ohio State just to name a few because he is considered a great coach.