One of the hikers used a cellphone to call the Sierra Madre Police Department for help after getting separated from his friends in an area between Sierra Madre and Mt. Wilson Observatory around 9:15 p.m., authorities said.
A Los Angeles County Fire air unit located all three men around 3:20 a.m., according to Deputy William Harrington of the Temple Sheriff's Station.
They were confirmed to have been found about 30 minutes later on Rincon Red Box Road in the Angeles National Forest near Chantry Flat, Harrington said.
The hikers, who were all in their 20s, were reported to be in good condition.
The Montrose Police Department, Crescenta Valley Sheriff's Station and Altadena Sheriff's Station assisted in the search.