My Stewart Slammer has bamboo in it and I definitely shot it in the single digits this past winter. Leon (the bowyer) never mentioned that it could get too cold. Someone else might have different information, but my bow was built for hunting and that can mean real cold. dwc

As David/dwcphoto implies above, with fiberglass lam bow it really doesn’t matter much what’s inside — they are good to go for a very wide range of temps and heat is a greater threat than cold. If there is no glass in the bow, it’s a whole different story. When it’s even moderately cold I always “warm up” my boo-backed osage (and other all-wood) bows by drawing them every now and then as I hunt, or carrying a stump arrow for an occasional shot. Good luck