Nesting season is when birds actively build nests, lay eggs, and raise their hatchlings. Tree care during bird nesting season in Sonoma County requires extra diligence and awareness. Disrupting these fragile habitats can have real environmental and even legal consequences.

Sonoma County is home to hundreds of bird species that support our local ecosystem. They help control insect populations, spread seeds, and pollinate plants. Many birds in California are also protected under federal law, including the Migratory Bird Treaty Act. This law makes it illegal to harm, disturb, or destroy active nests.

At Vintage Tree Care, we have wildlife-trained arborists on staff who specialize in protecting birds, mammals, and habitats during tree work. They are trained to identify active nests, follow environmental laws, and use best practices to reduce wildlife disturbance.

In this guide, we walk you through how to care for your trees during bird nesting season, so you can keep your property beautiful and local wildlife safe.

When is Bird Nesting Season in Sonoma County?

In Sonoma County, bird nesting season generally lasts from April to September, though some species begin as early as February.¹ According to the Redwood Region Ornithological Society, Sonoma County can be home to 466 different bird species, each with their own unique nesting patterns and timelines.²

Songbirds like robins and sparrows complete a full nesting cycle in just a few weeks. Raptors like hawks, eagles, falcons, and owls need more time to develop, so their nest sites may remain active for several months.

Every bird species contributes to the health of our local ecosystem. As Fred Frey, certified arborist and owner of Vintage Tree Care, puts it, “Aside from simply adding beauty, birds play a vital role in the stability of our environment.”

This is why our arborists take extra care during nesting season, using thoughtful practices that help protect both trees and the wildlife that depend on them.

How to Identify Active Bird Nests

Identifying active bird nests before any work begins is the first step to safer tree care for both wildlife and property owners. Disturbing an active nest not only harms local birds but is also a federal offense under the Migratory Bird Treaty Act (MBTA).

This law protects over 1,000 different species, and many of them nest in Sonoma County trees. Breaking it can result in thousands of dollars in fines and even criminal penalties. Knowing how to spot active nests is essential for ensuring tree care is done responsibly and legally.

“While there are many types of birds in Sonoma County, some very common ones we come across during tree care are hawks, acorn woodpeckers, hummingbirds, and crows,” Frey says. “Certain birds nest in branch unions or portions high in the tree. Some build nests on the ends of branches. Other birds nest inside cavities or holes.”

Below is an overview of the different types of bird nests commonly found in Sonoma County and when they are typically active.

Cup Nests

Pendant Nests

Image Credit: Dennis G. Jarvis, CC BY-SA 2.0, via Wikimedia Commons

Cavity Nests

Platform Nests

Tree Care Best Practices During Nesting Season

Proper tree care can be highly beneficial for our local birds. Keeping trees stable and healthy ensures they have the structure they need to build nests, feed their young, and remain safe from predators. But nesting season typically overlaps with peak growing season. This is why being extra cautious during necessary tree maintenance is important this time of year.

Below, we list key tree care best practices during nesting season to help keep your property beautiful and safe while also protecting local wildlife.

1. Strategic Tree Care Timing

During nesting season, it’s important to avoid more disruptive tree maintenance tasks like heavy pruning or tree removal. As Frey explains, “Proper tree care in support of bird activity can include timing the care of trees around critical nesting periods for birds.”

Tree work to avoid during nesting season:

• Tree removal (unless the tree is an immediate safety risk)
• Major pruning or canopy thinning
• Palm tree trimming
• Hedge trimming and shrub removal
• Vegetation clearing projects

The best way to avoid nesting season conflicts is to schedule in-depth tree maintenance during the fall or winter. This is when trees are dormant, and most birds have left their nests. If work is necessary or time-sensitive, trees should be carefully inspected for active nests before any work begins.

2. Pre-Work Nest Checks

Before any pruning, removal, or maintenance can begin, the tree must be inspected for signs of active nests. This includes looking for visible habitats, listening for birds, and identifying behavioral cues that indicate nesting.

Since different species nest at varying heights and parts of the tree, this step requires thorough experience and training. Identifying these nests early on allows work to be planned in a way that avoids disturbance as much as possible.

3. Adjusting Care Around Nests

If a nest is identified and the work can’t be scheduled for another time, tree care methods must be adjusted to reduce stress on nesting birds. As Frey puts it, “Observation, listening, and reacting properly to nesting activity are all steps that arborists can take to minimize impact with nesting birds.”

Limiting noise, avoiding certain branches, and working in phases are all ways to minimize disruption.

4. Selective Pruning and Preservation

Regardless of whether a nest is present, it’s important to keep birds at the forefront of tree care and take strategic steps to preserve their habitats.

Strategic pruning strategies can support tree health and bird habitats. “We often retain parts of a tree that can be used for future nesting purposes,” says Frey. This involves making selective cuts that improve the structure while preserving potential nesting areas, such as branch unions or strong limbs.

Additionally, trees should only be removed during nesting season when they pose an immediate risk to people, structures, or wildlife. Even if a tree has cavities or seems beyond saving, sometimes the right strategies can help it recover while preserving key nesting areas a bird might call home.

5. Prioritize Proactive Tree Care

Healthy, mature trees are more likely to support nesting seasons year after year. That’s why it’s critical to address disease, pest infestations, and structural problems before they become severe. Proactive maintenance, like proper pruning, pest management, and regular monitoring, helps a tree remain beautiful and safe.

Contact the Wildlife-Trained Arborists at Vintage Tree Care

By keeping up with routine maintenance and seeking proper care as problems arise, you can keep your trees strong, healthy, and ready to support the local ecosystem for years to come.

“At Vintage Tree Care, we are acutely aware of the role that birds and wildlife play in our environment, and how it relates to our care of trees,” says owner Fred Frey. “We have developed partnerships with places like The Bird Rescue Center to gain a better understanding of how to preserve and restore habitats when possible, as well as assist in rehoming birds that have been displaced in our community and surrounding areas.”

If you need tree care services during nesting season, working with a wildlife-trained arborist makes all the difference. Contact us online or call (707) 495-4686 to schedule an assessment today and contribute to a healthier environment for years to come.