If backlot were to be running there would need to be track heaters added, that ride does lots of rollbacks towards the haunt season where temps are a colder. Adventure Express seems like it would be able to run, even when riding in cooler temps the ride seems to not lose much speed at all (To me). As for the wooden coasters, they all can run easily, however the ptc maintenance programs for the rides seems to be the only reason they don't run. Since mystic has millennium flyers it seems like the maintenance period for those trains are significantly shorter. DB would valley. Orion has so much speed that it would easily make it through, however even though some nights aren't that cold, some are very cold which could be a free ticket to hypothermia, so for consistency reasons it is not open. Banshee likely could make it through, (as seen via chad showalter's) it has cycled in below freezing temps with snow falling. Again, I don't know how it would be if it would be too cold for humans with the train design. The Bat seems like it could work fine, however with such a rare ride type I wouldn't risk adding more wear to it so it can last longer. Flying ace, I don't think it would be able to make it through, it goes pretty slow. Woodstock express is in the same boat as beast and racer, the ptc maintenance program is lengthy. Invertigo I have no idea, (I personally don't like that ride anyway so I wouldn't ever care if it was open). Surf Dog is always plagued with issues when operating during the normal season, I think the cold air would only make those technical issues worse.