How cold does it have to be so your can of starting fluid wont work. Well it was -15 when I tried to start the snowblower and had to warm up the starting fluid before I could use it. The John Deere walk behind blower started up right away tho. That old beast has so many rattles I dont know how it keeps going. Its a blower I use at work to clean up the entries after the blade. I dont know what the last guy used for oil but you have to pull the rope with 2 hands. If the darn thing wouldn't start I could stay inside in the warmth.