Police were called at 5:39 p.m. May 14 to a wooded area off Greenwood Street, where a resident of Springhurst Street said she had just been assaulted by another Yorktown resident.
Officers Timothy Kolkman and Michael Woodard investigated.
The 18-year-old is alleged to have repeatedly punched and kicked the victim, fracturing her nose and cutting her face.
Judge Raniolo issued a temporary Order of Protection and sent the woman to Westchester County Jail on $500 bail. She is due back in Yorktown town court May 27.