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The hills support seasonally verdant non-native grasslands, with native chaparral and oak woodland habitats,

Los Osos Oaks State Natural Reserve lies on the northwestern slope, near the community of Los Osos.


  1. ^ a b "Irish Hills". Geographic Names Information System. United States Geological Survey. Retrieved 2009-05-04.
  2. ^ Google Books; "Seismotectonics of the Central California Coast Ranges", edited by Ina B. Alterman, Richard B. McMullen, Lloyd S. Cluff, D. Burton Slemmons.