Concepción de Ataco is a municipality and city within the Ahuachapán Department, El Salvador. It has an area of 61.03 km ² and a population of 18,101 inhabitants (est. 2006).
The municipality administration is divided into 11 cantons, which are: El Arco, El Limo, El Naranjito, El Tronconal, La Ceiba, La Joya de los Apante, La Planxa, San Jose, Shucutitán and Texusín Chirizo. Atacos's population has pre-Columbian origin and was founded by Yaqui Indians or pipiles in central Apaneca Mountain Range.
In Nahuat, Ataco means "high place of springs.”
Ataco experiences a subtropical highland climate. Ataco's high elevation gives the area one of the nicest climate ranges in El Salvador. Temperatures never go above 23 °C (73 °F) and always stay cool during the night. Sometimes it can be very chilly. The lowest temperature recorded was 4 °C (40 °F) which occurred during a cold front in November 2010. The fact that the city receives a lot of precipitation, and that the temperature is relatively cool but not cold, makes the place ideal for plants of many types to grow; it is usual to see a low of flowers, pine trees, and "veraneras" in Concepcion de Ataco and in the surrounding areas. Because the town is located on a mountain the sidewalks are designed to be really high from the street, because when there is heavy rain all the runoff from the mountain could flood the road with a couple of inches. The month with the highest rainfall is July with 316 millimeters of rain (13 inches). The average coolest months of the year are October and November with temperatures as low as 10 °C (50 °F) (due to a high presence of wind during this period of year).