You can be on the wrong tyres for the weather, even if the deadline to switch tyres hasn’t passed yet. If you have the know-how to fit your own tyres, and are able to keep an eye on the weather when planning journeys then tyres can be fitted whenever you feel like you have the time to get the winter treads on. It’s typical for many to put off changing to winter tyres, meaning getting an appointment around the time of the first snowfall or the deadline to change from summer rubber (depending on which arrives first where you live) can be very hard.