Police said officers responded around 10:20 p.m. to reports of a fight and shots fired in front of a home in the 2400 block of Orchid Street where a large party was taking place.
Officers arriving on the scene found four victims under 18 suffering from gunshot wounds, police said.
All four were taken to area hospitals to be treated and each of the victims is listed in stable condition this morning, police said.
No suspect information was available. An investigation into the shooting is ongoing.
Anyone with information about this crime is asked to call Fairfield police at (707) 428-7600, the 24-hour tip line at (707) 428-7345 or Crime Stoppers at (707) 644-7867. Callers may remain anonymous.