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Mount Diablo Trails Alliance

Student Ambassadors

CIU Project Maps

Impact Report and Maps

Resource Library

Learning Center

Responsible Recreation

Report Trail Damage

Mount Diablo Trails Alliance

Student Ambassadors

CIU Project Maps

Impact Report and Maps

Resource Library

Learning Center

Responsible Recreation

Report Trail Damage

Student Ambassadors

Folder: Trails 2035

CIU Project Maps

Folder: Dig Days

Impact Report and Maps

Resource Library

Learning Center

Responsible Recreation

Report Trail Damage

Dig Days

Group of five people planting a tree in a grassy field, holding shovels and tools, smiling, with hilly landscape in the background.

Season Four schedule to be released in October 2026

Mount Diablo Trails Alliance

Responsible Recreation

Learning Center

Mount Diablo Trails Alliance
P.O. Box 812
Diablo, California 94528

Mount Diablo Trails Alliance (MDTA) is a 501(c)(3) nonprofit trails stewardship and access advocacy organization. MDTA is volunteer-led, building a Shared Stewardship model with California State Parks, focusing on Better Trails | Greater Access for all park visitors. Federal Tax ID # 99-4480469.