Sunan Abi Dawud Book 35, Hadith 26
The Messenger of Allah (ﷺ) had hair which reached the lobes of his ears.
I did not see any man with locks hanging down to shoulders in red robe more beautiful than the Messenger of Allah (ﷺ). Muhammad b. Sulaiman added: He had hair which touched his shoulders.
Abu Dawud said: Isra'il also transmitted it in a similar way from Abu Ishaq saying: "(his hair) touched his shoulders". Shu'bah added: (His hair) reached the lobes of his ears.
The hair of the Messenger of Allah (ﷺ) were up to the lobes of his ears.