With Call of Duty: Warzone being free to play, PlayStation Plus ownership will not be required in order to play the new free to play game. Call of Duty: Warzone will be available starting March 10 for players on PlayStation 4, Xbox One, and PC. PlayStation Plus membership is not required on PlayStation 4. However,
Source: N4G PC Call of Duty: Warzone PlayStation Plus Isn't Required (But Xbox Live Gold Is)