When will swarming end in this crazy season?

[Boston Bees]

We had this happen to our barn yesterday. It happens every year and we thought the plastic may dissuade them this year.
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That looks like a tough structure to make beeproof!

 

[RogerIvy]

That looks like a tough structure to make beeproof!

Yeah. We’re gonna need to get it right though. Maybe there is a hole in the membrane behind the feather boards.

 

[Hux70]

In Worcestershire I've had swarm preparations and splits mid April and a hive that has had no sign of swarming filling up its 2nd super.