If you Google "Can trespassers sue", there are numerous examples of it happening. I don't have the desire to weed through them all to find close comparisons or research jurisdictions, but it seems to be possible for trespassers to sue for negligence, but I don't think it's a given that they will win. There are probably a lot of factors at play.
One difference I read is that if an obstacle has to be altered in some way by the trespassers for them to gain entry (like cutting a fence, breaking a locked gate, etc.), then it protects the property owner more than something that that just has to be avoided (like a short fence or jersey barrier). That was a British source though, so I don't know if Alberta is the same.
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