Pre-breed gobbling builds slowly through cold mornings and accelerates as flocks break up and toms start scouting hens. Peak gobbling typically lands a week or two before peak breeding, when toms are advertising hard but hens haven't fully receptive yet. Once peak breeding begins, gobbling can drop sharply because toms are with hens.
For state-specific gobbling and breeding windows, see the turkey season calendar pages — they track regional phase shifts that affect calling effectiveness.