Meat keeps just fine in winter as long as you don't let other animals get to it. Foraging/gathering plant based food is also much less productive in winter. I

Meat keeps just fine in winter as long as you don't let other animals get to it. Foraging/gathering plant based food is also much less productive in winter. If you kill it at the right time it will feed you until spring. That said I think that approach won't work well with the climate in Mexico.