Police are appealing for any witnesses who may have seen a vehicle fitting the description of the getaway car or anyone in the area who was acting suspiciously around the time.
The second robbery was just under an hour later at the Thirsty Liquor store, in Levin, at 9.15pm.
Detective Sergeant Jonathan Oram, of the Palmerston North CIB, said: "Two men entered - one carrying a knife and one carrying a hammer.