Forest will find out when they make the trip up north to face Darlow and fellow ex-Red Jamaal Lascelles when the fixtures are released on Wednesday.
And the shot-stopper says his old club can expect an "overwhelming" atmosphere, with big crowds expected, despite the Magpies' drop into the second tier.
"I can't believe the support last season," he told the club's official website. "They packed the stadium week after week which, given the situation of the team, was just amazing.
"We made it hard for most teams who came here since Christmas and it can overwhelm some sides, as we've shown on a few occasions.
"We need to make the stadium a fortress in the Championship because there will be teams who will be intimidated, and we have to use that to the best we can.
"But we have to be consistent in our performances home and away because we weren't last season and we need to change that if we want to give ourselves a good chance of getting promoted."
And Darlow, who will start next season as No.1 for Newcastle, was delighted to see Rafa Benitez agree to stay on as manager, with the Spaniard having signed a new deal last month.
"The fans showed how much they wanted Rafa here and myself and the rest of the team were no different," said the 25-year-old.