i live in boulder colorado right now. we just got dumped on last weekend i had my sport tires on and overnight i couldn't drive, it took me about 10 minutes of peeling out to get my car into my tiny garage to put the winter tires on and it was well worth it. without the winter tires i would have crashed my car on just my driveway, but i had to push it. i crammed two snowboards a pair of skis and two friends in my car and went to breckenridge to snowboard last sunday. it was snowing non stop for two days, on the way back it took me 4 hours to go 10 miles in stop and barely go traffic up a 7 percent grade. trust me the winter tires proved their worth that night, over all through the night there were 3 jackknifed semi trucks, and about 3 dozen other cars of all sorts stuck in the snow, and i never had a problem besides a split second of no traction before i got moving.
i guess in your case if it is getting cold enough up there for snow to form, it might be a safer option to just put the snow tires on now so you don't have to worry about it later. yes you can't drive as fast, but you can still drive fast enough to get a hefty fine. If you don't put them on now, put them on in the first sign of snow, just hopefully it won't snow before you get to doing it.
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