So I left a 10-pound bag of 2-row pale malt in my car, which is outside in Chicago, where the temp gets below freezing at night. Is there any reason for me to be concerned about the temp having a negative affecting on the grains?
I store my grain in the freezer, so IMO.... no.
...Free at last! Free at last! As of 1 July the state of Mississippi has
Set My Kettle Free!
no, so long as the liquid yeast found its way to the house
Pretty much the only things that degregate grains are moisture, oxygen, and bugs. Keep those three away from the grain, and it'll stay good almost indefinitely.
Cold temps generally will help keep those items out your grain.
Primary #1 - Oktoberfest
Primary #2 - Chamomile Honey Wheat
Primary #3 - EMPTY!
Secondary #1 - Downtown Flanders Brown (brewed August 2012)
Keg #1 - Coffee Vanilla Stout
Keg #2 - Fall of the Ukraine Baltic Porter (lagering in keg)
Keg #3 - EMPTY!
Bottled - NONE!