Skip Navigation
Bishop Peak in San Luis obispo City of San Luis Obispo
Parks & Recreation Department

SearchContact UsCity Home

Irish HillsIrish Hills


Difficulty: Moderate to Strenuous

Peak Elevation: 1,100 feet

Distance: 5-7 miles round trip

Estimated Time: 2-4 hours

Total Area: 941 acres

Development and design provided by
Gaia Graphics and Associates



LOCATIONS of the Prefumo Canyon
and Madonna Road Trailheads:
Map your trip to Irish Hills (Madonna Road) address approximate


Prefumo Canyon Trailhead: From Highway 101, take Los Osos Valley Road north towards Los Osos. Turn left onto Prefumo Canyon Road. Follow this road for one mile and the trailhead will be on the left after a bridge crossing.


Madonna Road Trailhead: From Highway 101, take the Los Osos Valley Road north towards Los Osos. Turn left on Madonna Road. Follow the street to the end and find parking on the street, then walk up the dirt road to the trailhead.




The topographic maps (included below) may be used for terrain review prior to or during a hike.


Printable Map: 8.5x11

View Only Version: 11x17



  • The Irish Hills were named by Irish immigrants who found the hills to be reminiscent of home.

  • Roads were made during WWII with the purpose of looking for minerals. The mine was for manganese (used to cool iron ore in the metal making process).

  • The house at Madonna Trailhead is an old school house that was once the center of the Irish Hills School District. The Irish Hills School District merged with the Laguna District in 1943.

  • The property was acquired by the City in 1998-2001.





About the Department | Programs and Services | Advisory Bodies
FAQs | Documents Online | Department Home

About the City | Visiting SLO | City Government | Employment
Bids & Proposals | FAQs | Press Room | How are we doing?

©2014 City of San Luis Obispo