“I found it necessary to write appealing to you to contend for the faith that was once for all delivered to the
saints.”
Conservative scholars generally date the book of Jude to
between A.D. 66 and 90. In his book The Untold Story of the New Testament Church, Frank Viola opts for a likely date of A.D. 68. William MacDonald uses internal evidence to place authorship between A.D. 67 and 70. I have not come across much that would incline me to argue with either man.
All these estimates place Jude as one of the very last books of the New Testament to be written and distributed to the
first century churches.