This state's classification carries no date range for the species.
Delaware's codified regulation (7 Del.Admin. Code 3900-4.0) explicitly states: 'It shall be unlawful for any person to hunt for ruffed grouse during any period of the year.' Structural, standing closure - not merely a missing-data situation.
Confirmed absence, structural: ruffed grouse hunting is prohibited year-round in Delaware (7 Del. Admin. Code 3900-4.0); no population program of any kind exists.