So far it has done well for me but we have not had any single digit nights yet. I done a little research on it before I tried it and from what I gather the hotter it is the more it will absorb moisture. With the freezing temps. , it will not absorb alot and is about like using peat moss. I like it because it is alot finer the peat and blends in better. Once we get some good cold nights I will test them to see if they still fire at that point.