dont take chances, i got caught out up there once in bad weather and the trip took 5 hours...not nice. coming from antalya i went to turn back but two lorries had jacknifed blocking the road behind me, the drivers advised me to carry on. a very scary trip,i spotted about 5 cars that had slid off the road and been abandoned.
make sure you take snow chains for your tires,fill up with fuel before you go also a good idea to check with the bus station what the conditions are like.
i take the coast road now if am in any doubt about conditions.