Well, I just checked the Long Trails, and nope, no mention of the word "cold".
All three tires I've listed say the same thing: "Max load of xxxx lbs at max pressure of xx psi". Absolutely no mention of the word "cold".
I don't think speed rating has anything to do with it: my Kumhos are V-rated and the Toyos are Z-rated.
The only thing I can think of is that manufacturers make a different production run for Canada (which is where I am). Seems unlikely, but maybe that's it. Now that I think about it, my tires also state the maximum load in kilograms and the maximum pressure in kilopascals. Is that the case in the U.S. also?