We usually start seeing swarms in early May through June here in Portage County.
Our bees did well this year (lost just 10% as of a few days ago). Most hives are very strong with a big population of bees already. We plan on re-queening in mid-April and doing splits to try and avoid swarming.
I'm a little south of you in Canton. Every year the swarm season starts at different times depending on the weather, but what seems to be one consistent factor is that swarming usually starts up at about the same time that the apple blooms are peaking. The first two weeks after apple bloom seem to be the prime swarm period, but swarms will continue to be cast for about a month after apple.
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