Sixfields pitch waterlogged
Tuesday night's game with Rochdale at Sixfields was postponed because of a waterlogged pitch.
The Football League asked local referee Andy Woolmer to check the conditions and he ruled the pitch unplayable.
The recent heavy rain has left the pitch waterlogged, with the high water table causing drainage problems.
Supporters who had purchased tickets for the game are asked to keep them safe as they will be valid for the rearrangement. Refund details will be announced when a new date is confirmed.