Summer has been cancelled in Manitoba. We had two consecutive nights of frost a week or so ago; temps are still as low as 36F some nights.
I have Fathead Minnows living in the inground pond, which are quite capable of surviving beneath ice. But my container "ponds" contain only Ameca splendens and Jordanella floridae, both of which I put out during the short-lived warm blip when water temperatures were around 60-65F. Currently, it's at 44F. I have no idea how they are doing, hard to tell with the thick plants in there. I saw a live moving fish dart past this morning, so...fingers crossed.