Rocklin is oak country built on granite. The town grew up around its quarries, and the oaks that were here first are still the largest living things in most of its neighborhoods, parks and parking lots. I am Christopher Hodge, an ISA Board Certified Master Arborist, and I assess, diagnose and document trees in Rocklin. I run no removal crews, so I have no stake in whether a tree comes down.
The oaks of Rocklin
Three native oaks make up most of Rocklin's woodland. Blue oak holds the dry, shallow ground over granite and drops its leaves in winter. Interior live oak grows alongside it and stays green all year. Valley oak takes the deeper soil along the creeks, Antelope Creek and Secret Ravine among them, and gets far bigger there than either of the others.
Most of those oaks now stand in yards, parking lots and greenbelts that were built around them, and their troubles follow from that. Soil gets raised or cut inside the root zone. Pavement goes over roots. Lawn sprinklers wet the base of a tree made for dry summers. The tree does not react right away. It thins out a few years later, and by then nobody connects it to the work.
So when I look at a Rocklin oak I start with the history of the ground and the base of the trunk, then the canopy. A conk or a mushroom at the root collar, a canopy thinning from the top, or bark sloughing off a limb each point somewhere different, and the name of the organism decides what can be done.
Blue oak deserves the most patience. It is slow growing and long lived, and University of California researchers note that most blue oak stands are made up of medium to large trees with few or no young ones underneath. In a yard that means the old tree has no successor.
Granite ground and shallow roots
Rocklin's name is not decorative. Granite mining began around 1864, twenty two quarries were operating by 1910, and in 1912 nearly two thousand train carloads of granite left town for the state capitol and for buildings in San Francisco. What that history means for a tree is rooting volume. Blue oak is adapted to shallow, lean, well drained ground and holds on where little else will, but shallow soil over rock concentrates roots in the upper profile and puts them squarely in the path of trenching, driveway cuts and pool excavation. On this kind of site the root plate matters more than the crown, and it is the part nobody looks at.
What to watch for on a Rocklin oak
- A canopy that thins from the top down over two or three summers
- Mushrooms at the base in fall, or a shelf fungus on the trunk
- Black, crusty patches on the bark of a blue oak after dry years, the mark of charcoal canker
- Clumps of mistletoe that keep getting bigger
- Soil, mulch or pavement piled against the trunk above the root flare
- Lawn sprinklers that hit the trunk all summer
None of those is a verdict. Each one is a reason to find out what is going on before you decide anything about the tree.
Rocklin's oak ordinance, briefly
Rocklin protects oaks, and only oaks. Under Chapter 17.77 of the municipal code, a native oak with a trunk six inches or more in diameter needs a city permit before removal, and the city measures a multiple trunk oak by its largest trunk alone. An oak of 24 inches or more in good or fair condition is a heritage tree and carries more replacement planting. On commercial, industrial and multifamily property a healthy oak cannot be removed at all. The condition of the tree decides most of it, and that is the part I document. The city's own pages are linked at the bottom of this page.
What I do here
- Diagnosis of oak decline, decay fungi and root disease
- Tree risk assessment for oaks over homes, drives and parking areas
- A look at the trees before a purchase, a remodel or new landscaping
- Heritage oak condition assessment
- Oak reports and tree preservation plans for city permits
Book an assessment
A site assessment with a written report starts at $500. The site visit on its own is $250 and covers up to one hour on site. Call or text (530) 391-6100 and tell me what the tree is doing.
Book a consultationFrequently Asked Questions
What kinds of oaks grow in Rocklin?
Mostly three. Blue oak on the dry, shallow ground, interior live oak beside it, and valley oak on the deeper soil along the creeks. The city's own list of native oaks is longer and adds black oak, canyon live oak, scrub oak and several natural hybrids.
Should I water my Rocklin oak in summer?
Not if it is an established native. Blue oak, interior live oak and valley oak all grew up on winter rain and a dry summer, and the University of California advises keeping summer irrigation away from the trunk of an established oak. If a lawn already runs to the base, pull the water back in stages. Do not shut it off all at once.
Is there a certified arborist who serves Rocklin?
Yes. I hold the ISA Board Certified Master Arborist credential, WE-14385B, which is the level above ISA Certified Arborist, along with the ISA Tree Risk Assessment Qualification. I come to Rocklin from Placerville as an independent consultant. I assess trees and write reports, and I do no pruning or removal.
What does it cost to have an arborist look at a tree in Rocklin?
A site assessment with a written report starts at $500. If you only want me to look at the tree and tell you what I see, the site visit alone is $250 for up to an hour. City permit reports are quoted ahead of time because the city sets what they have to contain.
How does the city measure a multiple trunk oak?
By the largest trunk only, at 4.5 feet above the root crown. The other stems are not added in. Placer County, Auburn and El Dorado County all add stems together, so measure your tree the Rocklin way before you assume it is or is not regulated.
Does the ordinance protect pines and cedars too?
No. Chapter 17.77 covers oak trees only, of the species the city lists as native to the area. Conifers and other broadleaf trees are outside it.
Sources and official pages
- UC Oaks: Blue Oak WoodlandUniversity of California description of blue oak woodland, its shallow soils, slow growth, and lack of young trees.
- UC Oaks: Summer Irrigation of Established Oak TreesWhy established native oaks should be kept dry at the trunk in summer.
- Rocklin Municipal Code Chapter 17.77, Oak Tree PreservationThe ordinance enacted by Ordinance 676 in 1993 and amended in 1996 and 1997, including the largest trunk measurement rule, heritage definition and mitigation.
- City of Rocklin Planning Services, oak tree removal permitsThe Planning Division processes the oak tree removal permit, which the city issues without an application fee.
- Rocklin oak tree preservation guidelinesThe guidelines adopted by resolution alongside the ordinance, including the appendix listing the oak species treated as native to the area.