Ban them? Heck, kayaks were invented in ice country. But you have to know your gear and understand cold water. I always feel a little weird wearing a drysuit for early spring paddling. It can be a nice day.
About 2 years ago I was doing some testing testing for an up-coming book on anchoring (a few months). I had set some anchors in specific ways and needed to dive to record how they set. It was ~ 70F and I was wearing fleece pants, a turtleneck, and a tee shirt under that. The water, on the other hand, was high 40s. I put on a drysuit with gloves and hood but did not add fleece mid-layers. After all, I was only going to be a few minutes and that gear was hot enough. Well, the suit was dry, and nothing was shocking, but my arms were really starting to feel it within 10 minutes. I could touch bottom, so it wasn't dangerous. I was not shivering. But it made it clear that although I was wearing the MOST clothes I possibly could for the air temperature, it wasn't enough for the water unless I knew how to reboard a kayak (which you MUST before you leave supervised paddling).
It is hard to overstate the danger of cold water. This coming from a guy that hates PFDs and has ice climbing as his other hobby.
About 2 years ago I was doing some testing testing for an up-coming book on anchoring (a few months). I had set some anchors in specific ways and needed to dive to record how they set. It was ~ 70F and I was wearing fleece pants, a turtleneck, and a tee shirt under that. The water, on the other hand, was high 40s. I put on a drysuit with gloves and hood but did not add fleece mid-layers. After all, I was only going to be a few minutes and that gear was hot enough. Well, the suit was dry, and nothing was shocking, but my arms were really starting to feel it within 10 minutes. I could touch bottom, so it wasn't dangerous. I was not shivering. But it made it clear that although I was wearing the MOST clothes I possibly could for the air temperature, it wasn't enough for the water unless I knew how to reboard a kayak (which you MUST before you leave supervised paddling).
It is hard to overstate the danger of cold water. This coming from a guy that hates PFDs and has ice climbing as his other hobby.