Flour, cereal, meal will all go wormy come spring when it warms up. We go thru 500 lbs flour /year. I store 50 lb bags outside in shed in ice chests (stays below zero 4-6 months) then around march i put the bags in outside freezer as they are half empty by then anyway. Something about the warm up in spring that sets the eggs in all flour to hatch. I lost 150 lbs of flour several years back when I didn't do this.
WE put in 300 lb yukon golds every May (always get 2500 lbs which we spread around the community)and usually plant 2 lb of carrot seed (pellet seed). Wifey usually freezes 75 gallon bags of carrots; great with moose, caribou stew all winter. Bottomline, nothing like new taters.
I’ve been told and read that Food Grade Diatomaceous Earth will kill the pests in the flour. You mix it in and since its food grade you can consume it without harm.
http://www.gardenharvestsupply.com/product/diatomaceous-earth-food-grade
I grew up in northern Maine - still in Maine - but I don't know's I could live as far north as you. A bit too cold and I couldn't make it through the long, sunless winters.
But moose stew - oh yeah.