Butter prices fell 10 per cent to a 19-month low in February, Stats NZ figures show.
The average price for a 500g block of butter fell to $5.20 in February, down from a recorded high of $5.79 recorded a month earlier.
Food prices rose 1.7 per cent on the year in February, driven by a lift in meat, poultry, and fish prices and restaurant and ready-to-eat food.
The lift was partly offset by the drop in butter prices.
"In January we saw milk prices fall to a 19-month low. This price fall now looks to be flowing on to other dairy products," consumer prices manager Gael Price said.