Bidwell Mansion’s Southern Magnolia Crowned California Champion

This article highlights the recent designation of a Southern Magnolia in Chico as California’s State Champion under the California Big Trees program. The tree’s impressive size connects Chico’s historic Bidwell Mansion to bigger conversations about urban forestry in the Bay Area and beyond.

It’s a story that echoes from Marin County towns like San Rafael, Mill Valley, and Novato to the streets of Chico. People are celebrating a living landmark that ties together history, science, and community stewardship—something that feels rare and meaningful these days.

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Largest Southern Magnolia in California Shines in Chico

From the edge of Bidwell Mansion State Historic Park, this mighty Southern Magnolia now stands as the State Champion—the largest of its kind in California. Cal Poly’s Urban Forest Ecosystems Institute and the California Big Trees program made the announcement, pointing to the tree’s role as a natural and cultural beacon for Chico and the wider region.

If you’re a Marin resident planning a weekend adventure, Chico might be worth the trip. You can see this living giant up close and take in some of Northern California’s rich heritage along the way.

Key Facts About the State Champion Southern Magnolia

The Magnolia’s measurements put it in a league of its own among California’s urban trees. Here’s what makes it stand out:

Height: 92 feet tall
Trunk circumference: 226 inches
Crown spread: 65 feet
Estimated planting date: around 1865, matching up with the construction of Bidwell Mansion

Richie Bamlet nominated the tree for the honor in 2026, emphasizing its connection to the mansion and its grounds. Cal Poly and park officials continue to document and preserve California’s remarkable urban trees, and this recognition shines a light on their ongoing work.

The Magnolia’s status as a living link to Chico’s cultural and natural heritage feels a lot like the pride folks in Marin County express when they talk about trees anchoring neighborhoods in San Anselmo, Fairfax, and Tiburon.

Even after the 2024 arson damaged parts of Bidwell Mansion’s site, park officials say the Magnolia is still going strong. That kind of resilience reminds me of Marin’s own urban forests, which have survived droughts, development, and all sorts of challenges while continuing to offer shade and a sense of place from Novato to Sausalito.

What This Means for Marin County and Bay Area Communities

Marin’s parks and open spaces already show a real commitment to healthy urban forests. The Bidwell Magnolia story gives a kind of blueprint for how local communities can get engaged with trees that matter.

Collaboration between state programs, universities, and municipal parks can turn a single tree into a symbol of conservation and history. In towns like Larkspur and Corte Madera, residents might find inspiration to support tree inventories, preservation plans, and community education about how big trees shape both microclimates and local culture.

How Marin Residents Can Engage

Here are some practical ways Bay Area residents can connect with the spirit of this Magnolia. Whether you call Sausalito home or you’re just passing through San Rafael, there’s a way in.

Support urban forestry programs in Marin. Try volunteering with local park districts, tree-care nonprofits, or get involved with city urban-forestry plans in Mill Valley or Novato.
Learn the science behind champion trees. You might want to check out talks or join a guided walk hosted by local arboretums or the Marin Municipal Water District’s ecosystem programs.
Share the story of the Bidwell Magnolia with neighbors in Fairfax or Tiburon. It’s one way to show how historic trees can shape a community’s identity and boost environmental health.
Plan a tree-centric day trip from the Marin coast to Chico’s Bidwell Mansion. There’s something special about seeing firsthand how a single tree can anchor a landscape’s history.

For Bay Area readers, the Magnolia’s story isn’t just trivia. It’s a nudge to document, protect, and celebrate the urban trees that serve as living legacies.

Visit the Bidwell Mansion grounds, or keep an eye on Cal Poly’s updates, if you want to learn more about California’s state champion trees and the ongoing work to preserve these natural monuments for generations in Marin and beyond.

Here is the source article for this story: Bidwell Mansion’s Southern Magnolia crowned California champ, still standing tall

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Joe Harris is the founder of MarinCountyVisitor.com, a comprehensive online resource inspired by his passion for Marin County's natural beauty, diverse communities, and rich cultural offerings. Combining his love for exploration with his intimate local knowledge, Joe curates an authentic guide to the area featuring guides on Marin County Cities, Things to Do, and Places to Stay. Follow Joe on Facebook, Twitter, and Instagram.