The last day of summer ain't till Sept. 29, don't try to end it early, I still got's lots of beach time and bike time to go.
And the original phrase was "knee high by the Forth of July" meaning if you were going to have a good harvest, the corn had to be about that high, by about that time. "Elephants Eye" is from Oklahoma, a Broadway musical by composer Richard Rodgers and librettist Oscar Hammerstein II. Though most people forget that, but as any midwesterner will tell you, it never gets that high, and certainly not in July.