Pasadena Volunteers Restore 1,000-Acre Urban Forest Trail

A morning walk through Pasadena's Arroyo Seco Trail becomes a community mission this Saturday, as volunteers gather to restore one of Southern California's most treasured urban forests.

The City of Pasadena and One Arroyo Foundation are hosting a free trail clean-up from 9:30 to 11 a.m. near San Pascual Stables. Volunteers will remove trash, pull invasive plants, and clear debris from the trail system that spans nearly 1,000 acres and 22 miles through the city.

The event marks National Trails Day, the 34th annual celebration organized by the American Hiking Society to inspire trail stewardship nationwide. Anyone can join, no experience needed, and all tools and gloves are provided.

The clean-up connects to something bigger. Last July, the city and foundation broke ground on a $500,000 restoration project funded by California State Parks to repair 3.5 miles of heavily eroded trails that years of use and deferred maintenance had made partially inaccessible.

The project aims to reconnect three major sections of the trail system: Hahamongna, Central Arroyo, and Lower Arroyo. These pathways serve as vital corridors for both people and wildlife moving through the urban landscape.

"The Arroyo Seco is Pasadena's greatest environmental and recreational treasure, and it belongs to all of us," said Daniel Rossman, executive director of One Arroyo Foundation. His words capture why dozens of similar community stewardship days have drawn consistent volunteer support.

The Ripple Effect

When communities care for shared spaces, everyone benefits. The restored trails will make the Arroyo Seco accessible to more families, seniors, and people with mobility challenges who currently struggle with deteriorated paths.

The urban forest also provides critical ecosystem services: cooling the city during heat waves, filtering air pollution, and offering refuge for native plants and animals. Every invasive plant removed gives native species more room to thrive.

Regular volunteer events build something beyond clean trails. They create networks of neighbors who know each other, care about their community, and model environmental stewardship for younger generations.

Volunteers should wear closed-toed shoes and long pants, and bring a hat, sunscreen, and water bottle. Parking is available along San Pascual Avenue or Stoney Drive, though the stable lot itself is reserved for equestrian users.

Generations of Pasadena families will walk trails made better by hands that showed up on a Saturday morning.