There are several factors, in most areas, that influence bears being at baits, at this time of year, from my experiences.
I have baited bears for just over 30 years, and here's what I have come to believe concerning bears, baits, location and time of year.
If you place bait at a low elevation it might come on early, but in many cases it will die off as the higher elevation snow melts and as things green up. The bear in many instances like this just move on to the higher country.
I used to bait bears in the Bookcliffs for many years, and some of our best early baits, just died off and we had other baits that would never get hit early, but come on strong around the 20th of May.
Most all our baits would taper off in late May and then come back on around June 10th or so. Those dates pretty well parallel the calving, and fawning season of deer, elk, and moose. Once that's over and the little one can run with their mothers, the baits seem to come back to life, unless it happened to be a low bait and in that case most of the bears have moved to higher country and don't return.
That has been my experience through the many years that I have baited bear.
Here's a photo of a bear taken in the Books many moons ago by a friend of mine just before Utah closed down baiting for a period of time.
Have a good one. BB