I want to change four of my tires to all season tires.i have a Nissan Sentra 2015 sedan I'm not sure what's the tire size. I wonder whether you might have in stock tires base on my description mentioned above.

Costco has vehicle service and the location of the store varies, but your best bet would be to give the store a call to ask them and schedule a appointment.

You can ask Google what size tires your make and model and your of car takes it will tell you

There are numbers on the side of your tires. That is what will tell them the size of tire.