California and Florida for sure have agricultural border controls, although Florida doesn't inspect passenger vehicles any more. But I wouldn't have expected them to include honey, either, bummer. From just a quick search, it looks like it's okay to bring honey into California. Doesn't Canada at least have restrictions on moving firewood, with the emerald ash borer spreading so quickly?

I didn't think I'd be able to bring honey from Europe into the USA, though, so only bought a little pot from a farmers' market on our last trip, just enough to taste with some local cheeses.