For information about stepparent adoption, go here: https://attorneytimjones.com/can-my-husband-adopt-my-child/
Can my boyfriend adopt my child?
Maybe.
Many judges in Idaho Falls and the surrounding area tend to have problems with non-spouses adopting. Although it’s certainly possible in some situations, I generally recommend getting married first. You’ll most likely have fewer problems with the judge, you’ll pay the adoption attorney less, and the adoption process will be quicker.
(Update 2014: an Idaho Supreme Court ruling in early 2014 makes it considerably easier for boyfriends to adopt. I still recommend being married, if possible, but this new ruling should make the process significantly easier if you’re not married).