The phrase "to last the winter" means to survive or endure throughout the entire winter season.
Sentences with «to last the winter»
It's slowly becoming colder and colder, so much so that I had to put away my green jacket and pull out this coat from last winter. (oliverstwistblog.com)
I've actually had the boots since last winter. (the-habit.com)
I had never really thought about the changing weather could (and should) affect my skincare routine until last winter when I realized just how dry and different my face felt. (maggiealamode.com)