Sonoma-Marin Tree Service connects homeowners with CSLB-licensed local tree service contractors for oak removal, from a single dead coast live oak over the driveway to a stand of tanoaks killed by Sudden Oak Death.
Sudden Oak Death: what it is and which oaks it kills
Sudden Oak Death is caused by Phytophthora ramorum, a funguslike pathogen. According to UC IPM, tanoak is highly susceptible, and coast live oak, California black oak, Shreve oak, and canyon live oak are also killed. Valley, blue, and Oregon oaks in the white oak group are not thought to be susceptible. California bay laurel is the key to spread: spores from infected bay leaves drip or blow onto oak trunks in the rain, and UC IPM calls nearby bay the greatest predictor of cankers on oaks. UC Cooperative Extension reports the disease spreading in west Marin and northern Sonoma County.
Signs UC IPM describes:
- Thick, dark, sticky sap bleeding from the bark of the lower trunk
- Discolored tissue under the bark, edged by a dark line
- A canopy that turns brown over a few weeks, sometimes after a long decline
- Wilting shoot tips on tanoak, and leaf spots on nearby bay laurel
Symptoms alone cannot confirm the disease; UC IPM says a lab test is needed. Once an oak is dead, the question is how and when to take it down safely. Dead oak wood dries and becomes brittle, so these removals are best done before the tree starts shedding large limbs. If the tree is already dead and standing near the house, see dead and hazardous tree removal.
Protected oaks: check the rules first
Oaks are protected in most of the area, and the thresholds differ by jurisdiction:
- Santa Rosa covers valley and blue oaks at 19 inches in circumference, and coast live, black, and other oaks at 57 inches.
- Unincorporated Sonoma County requires a zoning permit under its 2024 ordinance for about 30 native species, oaks included, at 6 inches in diameter or more. Defensible-space work and dead or hazard trees within the defensible-space zone are exempt.
- Mill Valley treats tanbark oaks of 65 inches in circumference, and other oaks of 75 inches, as heritage trees.
- San Anselmo treats trees of 22 inches in diameter or more as heritage trees and notifies neighbors within 300 feet.
- Unincorporated Marin requires a permit for any heritage tree, or for more than two protected trees removed from a developed lot in 12 months.
Details for each town are on our Santa Rosa, Mill Valley, San Anselmo, Glen Ellen, and Petaluma pages. If the permit needs an assessment, see arborist reports and tree permits. No one can promise a permit will be approved.
How an oak removal is done
Big oaks spread wide, and their limbs are heavy and often reach over roofs and fences. Most removals near a home are done in sections, with limbs rigged and lowered by rope before the trunk comes down. Dead oaks change the plan: a climber may not trust brittle wood, so the contractor may use a bucket truck or a crane instead. Ask whether the quote includes hauling and stump grinding.
Keeping the oaks you have
Mature oaks do best with little pruning. Guidance from the California Oak Mortality Task Force, drawing on UC sources, is to prune mature oaks only to remove dead, weak, diseased, or dangerous branches, and to do it in the dry season, with June and July as the best months. The same guidance warns against summer watering close to the trunk; keep the area within about 6 feet of the trunk dry and undisturbed. See tree trimming and pruning for the rest.
Who should do the work
Tree removal in California is licensed by the Contractors State License Board, and new licenses are issued in the C-49 Tree and Palm classification. Before you hire anyone, look the contractor up at cslb.ca.gov and ask for a certificate of liability insurance. You can look up any license at cslb.ca.gov.
Worried about a dead or dying oak? Call (707) 634-8593 or request an estimate and we'll connect you with a local tree service contractor.
Tree services in Sonoma County & Marin County
- Tree Removal → Removal of dead, leaning, diseased, and unwanted trees, including large oaks, redwoods, and eucalyptus on tight or sloped lots.
- Storm-Damaged & Fallen Tree Removal → Fallen trees, split trunks, hanging limbs, and trees on roofs, fences, or driveways after North Bay winter storms.
- Tree Trimming & Pruning → Crown thinning, deadwood removal, structural pruning, and clearance pruning for oaks, redwoods, and ornamentals.
- Stump Grinding & Removal → Grinding stumps and surface roots below grade so you can replant, lay lawn, or build, plus full stump removal where needed.
- Arborist Reports & Tree Permits → Arborist reports for city and county tree removal permits, protected and heritage trees, and construction near trees.
- Defensible Space & Fire Clearance → Limbing up, juniper and brush removal, dead tree removal, and chipping for Marin evaluations and Sonoma inspections.
- Oak Tree Removal & Sudden Oak Death → Dead and dying coast live oaks, tanoaks, and valley oaks, including Sudden Oak Death losses and protected-oak permits.
- Eucalyptus Tree Removal → Taking down tall, brittle blue gum eucalyptus near homes, roads, and fire zones, and dealing with regrowth.
- Redwood Tree Removal & Trimming → Redwoods crowding foundations, driveways, and sewer lines, thinning redwood groves, and removals where a permit allows.
- Crane Tree Removal → Crane-assisted removals for big trees over houses, on steep hillside lots, and anywhere there is no room to drop or rig.
- Dead & Hazardous Tree Removal → Dead, dying, cracked, and leaning trees that threaten the house, the street, or the neighbors, with the paperwork hazard removals need.
- Roof Clearance & Limb Removal → Lifting limbs off roofs, gutters, chimneys, and decks for fire clearance, insurance letters, and plain peace of mind.
- Tree Risk Assessment → A qualified look at a leaning, cracked, or hollow tree before a storm decides for you, with a written recommendation.
- Lot Clearing & Brush Chipping → Clearing overgrown lots, thinning small trees and brush, and chipping or hauling the debris for building, fire safety, or sale.
- Fruit Tree & Olive Pruning → Dormant and summer pruning for backyard orchards, old olives, and heritage fruit trees on wine country properties.
- Palm Tree Trimming & Removal → Skinning and trimming tall palms, removing dead fronds and seed pods, and taking out palms that have outgrown the lot.
- Tree Cabling & Bracing → Support systems for split trunks and heavy limbs on trees worth keeping, installed and inspected to industry standards.
- Insurance-Required Tree Removal → Clearing trees and limbs an insurer has flagged before a policy renewal or non-renewal deadline, with documentation.
- View Pruning → Opening up bay, hill, and valley views with selective thinning and reduction that keeps the tree healthy and the neighbors on side.
Frequently asked questions
How much does oak tree removal cost?
It varies widely. National cost guides put a typical tree removal in the high hundreds of dollars to around $1,000, but a large oak over a house, on a slope, or dead enough to need a bucket truck or crane usually costs considerably more. Get a written quote after a site visit.
Does a dead oak need a permit to come down?
It depends on where you are. Many local ordinances treat dead or hazardous trees differently from healthy ones, but most still expect documentation. Unincorporated Sonoma County exempts dead or hazard trees within the defensible-space zone around a home. In cities such as Santa Rosa and Mill Valley, check with planning before cutting, and take photos either way.
Does Sudden Oak Death mean my oak has to be removed?
Not by itself. UC IPM says removal is not justified by the disease alone; the decision should rest on whether the tree is a hazard, ideally with input from a certified arborist. A dead or dying oak near a house, road, or play area is a different matter, and UC Cooperative Extension in Marin advises removing dead oaks and tanoaks that pose a fire or fall risk.
What happens to the wood from an infected oak?
UC IPM advises keeping infested wood and debris on site in infested areas, chipping small material and using larger pieces for firewood, and not moving wood or plant material out of the quarantine area. Ask the contractor how they handle wood from a Sudden Oak Death tree before work starts.
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