North Gate

III 2340 is the date of Buckland's foundation, and since the Gate is part of the Hedge built by the Bucklanders, it cannot precede this date. It seems that the Hedge wasn't erected immediately after the colonisation of Buckland (at least that is the apparent meaning of the words '[The Bucklanders'] land was originally unprotected from the East...'). The only specific dating evidence we have for the Hedge, and therefore the North Gate, is that 'It had been planted many generations ago...' (These quotes are from The Fellowship of the Ring I 5, A Conspiracy Unmasked).

The last definite mention of the North Gate is on the night of 1 October III 3018, when it was used by the Black Riders to leave Buckland. Many Shire buildings were destroyed during the following troubles, but it seems likely that the Gate would have survived.