This 22-mile urban nature reserve and bikeway starts in Weir Canyon and travels through six jurisdictions, enabling trail users to experience the diversity of the 50,000-acre Irvine Ranch Land Reserve.
Designated in 2006
• View more details for this trail
in the NRT Database
• Learn about the NRT Program.
Your journey begins with a docent-led hike in rugged, oak-filled Weir Canyon. It then takes you south through six jurisdictions— five cities and a portion of the County of Orange— guaranteeing that the only constant on this trek is an exhilarating change of scenery and topography.
The Mountains to Sea Trail— the backbone of the 50,000-acre Irvine Ranch Natural Landmarks— was created through cooperative municipal planning to let people of all ages and abilities experience unimpeded the magnitude, magnificence and diversity of the Irvine Ranch open space.
From Weir Canyon to Irvine and Peters Canyon Regional Parks, past the historical Irvine Ranch agricultural headquarters and along the San Diego Creek Channel to Upper Newport Bay, there's no more enjoyable way to experience one of the nation's most spectacular networks of parks, trails and preserved natural lands.
Activities allowed on the trail include hiking, running, and walking; equestrian riding; and bicycling. Interesting areas along the trail and open space include Weir Canyon Wilderness Area, Irvine Regional Park, Peters Canyon Regional Park, San Joaquin Wildlife Sanctuary, and Upper Newport Bay.
The trail is largely asphalt surfaced, with some sections of concrete and crushed rock. Much of the trail is accessible with an average width of 120 inches and nearly flat grades.
The trail runs through the Cities of Anaheim, Orange, Tustin, Irvine, Newport Beach, and the County of Orange. The trail managing agency is the Irvine Ranch Conservancy.
Nearly 40,000 acres of open space on the historic Irvine Ranch have been designated a Natural Landmark by both the State of California and the U.S. Department of Interior. This honor recognizes the exceptional value of these lands to California and the entire nation. The open space through which the the Mountains to Sea Trail runs is part of the 50,000 acres of open space preserved on The Irvine Ranch. The land first received national recognition in 2006 when most of the protected areas on The Irvine Ranch were singled out for their rare biological and geological features through designation as a National Natural Landmark and California Natural Landmark.
Irvine Ranch Conservancy Phone: 714-508-4755 4727 Portola Parkway, Irvine, CA, 92620-1914
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