The Cobblers moved steadily clear of the relegation zone throughout the month with four wins and three draws from a hectic eight-game schedule brought them 15 points from a possible 24.
Martin Ling of Torquay and Steve Davis of last weekend's opponents Crewe Alexandra are the other nominees with the result being announced on Friday.
Boothroyd meanwhile has told BBC Radio Northampton that when the Cobblers last faced their Good Friday opponents Oxford United they went into the game with a 'Blue Peter' team as the new manager waited for the transfer window to open and be able to put his own stamp on the squad he had inherited.