I'm in CA and generally hear more toms gobbling and trying to mate in the beginning of our season (starts last Saturday in March and goes for 37 days into the beginning of May) than the end. In "general" in CA, turkeys have finished mating before the end of the season (at least in my hunting areas) so the last half of the season is not usually as productive. I've never hunted turkeys in Montana so don't know if the turkeys behave similarly up there or not. Hopefully this helps some.
In my hunting area in N. CA this morning, there were numerous toms gobbling at sunrise. My buddy and I even saw 1 tom strutting for some hens but none were coming to calls or decoys. So my buddy and I switched tactics to running and gunning and I got one. Woohoo!!!!