Events that occurred on 5 March
 On Earth
- 1959 - J.R.R. Tolkien writes a letter to William Ready.
- 1964 - J.R.R. Tolkien writes a letter to Eileen Elgar (see Letter 255) and encloses the manuscripts Concerning ... 'The Hoard' and Kinship of the Half-elven.
- 1971 - Voice actor Yuri Lowenthal is born.
- 2004 - The first day of "RingCon IV" in Seattle.
 In Arda
- T.A. 3019:
- Wormtongue reaches Isengard at morn.
- Théoden and company reach Isengard at noon. They have a parley with Saruman and camp at Dol Baran.
- Pippin looks into the Orthanc-stone and a short time later a winged Nazgûl passes over the camp. In response, Gandalf sets out with the Hobbit for Minas Tirith.
- Frodo hides in sight of the Morannon, and leaves at dusk.