What are your temps like in Albuquerque this time of year? It might still be on the cool side. I can't tell you for sure, but I think it was in the upper 60s/low to mid 70s before my Prosopis juliflora leafed out completely. My Prosopis pubescens (screwbean) is a bit behind and hasn't fully leafed out yet.

It's a wonderful tree. It hosts the blue metalmark caterpillar.Do many poeple grow it in Arizona & New Mexico?

Your Mesquite should have leafed out by now, mine did around 1st of May, I am in Albuquerque.

Keep in mind that we live a bit outside (north of...) their normal range.

Yes. It did leaf out about a week after my initial post.