How many months have 28 days? All the months have 28 days (and more), however only February has a regular year length of 28 days and a leap year length of 29 days. But there are up to 28 days in each of the twelve months of the year. Other months, besides February, simply go over those 28 days on typical years. Every month has at least 28 days. However, February has 29 days in leap years compared to 28 in regular years. The Gregorian calendar has four months with 30 days and seven months with 31 days. For instance, every year, there are 31 da... More