How To Delete A List On Trello
Yeah, I thought about this the same day board deletion became true, but it's so hackish that "annoys the neatnik and engineer in me" even more than being unable to delete lists :(.
Create a new board and call it “To Delete” (you can call it anything you want really, I just call it that to make it a bit more obvious).
In the title bar of the list you want to delete, click the ellipsis / … / three dots and select “Move List”
Move the list to your newly created “To Delete” board.
Go to the “To Delete” board and select “Show Menu” (if it is not already visible on the right side of the Trello window/screen.
Select “More” in the board menu.
Select “Close Board” in the “More” menu then click the “Close” button to confirm.
You will then be presented with a “To Delete is closed” screen- click the “Permanently Delete Board” option then click the “Delete” button to confirm.