The Little Ice Age is not a dogma. It is an increasingly firm consensus backed by considerable evidence across a variety of sources. To disprove it, or even to call it into question, would mean finding systematic errors in several types of proxy data. Kelly and Ó Gráda have not cleared any of these hurdles, or even come close. The refutation of their arguments demonstrates just how strong the evidence for the Little Ice Age has become and just how important it is for historians to take it seriously.