Last year was weird. 2 feet of now at the beginning for April. No sign until mid-April, then it peaked second half of April. Heat wave hit after that and it was green everywhere. Took our bear mid-May... May long was a full on heat wave... didn't try too hard for a second and I think that was our last weekend out... I was surprised it went from 2 feet of snow to 3+ bear sightings a day before well before May and less a week into May.
I think you are right about bears showing up a little late, but I am hesitant to call the peak. The 3 years prior I would have said mid May every time. I am going to start "camping with a rifle" early, but I will start chasing mid April.