Can You Remove a Mature Oak Tree in Pomona?

You may be looking at a Pomona property with mature oak trees and wondering whether those trees can be removed to make room for construction. The short answer is that removal is not simply a site-clearing decision. According to a Pomona Planning Commission staff report, removing or relocating any healthy and mature oak tree requires a Major Oak Tree Permit.

That process can affect a property’s usable footprint, replacement planting, development timing, and possible in-lieu costs. This is general information and not legal advice.

What permit is required to remove a mature oak?

A Major Oak Tree Permit is required for the removal or relocation of a healthy and mature oak tree, according to the staff report’s description of Section 1300.J of the Pomona Zoning and Development Code.

The report says removal of any mature oak tree is subject to Section 1300.J, called Oak Tree Preservation, and requires Planning Commission action. The staff report does not give a minimum trunk size. It also does not explain what a minor permit would cover.

That distinction matters when you evaluate a property before purchase or development. A mature oak can limit where a building, driveway, utility connection, or other improvement might fit, but its presence does not establish that removal will be allowed. The permit findings and possible preservation alternatives still need to be considered.

Other California cities use their own tree rules. The processes described in guides about oak tree permits in Calabasas and protected oaks and sycamores in Arcadia should not be treated as substitutes for Pomona’s requirements.

What findings can support an oak removal permit?

The Planning Commission may base removal on findings that include development conflicts, utility or street interference, an oak’s condition, erosion concerns, and consistency with the permit process.

The findings address whether removal would cause surface-water erosion that cannot be satisfactorily mitigated, or whether a tree blocks a planned improvement or authorized use so severely that alternatives cannot achieve the permitted density, would cost too much, or would prevent reasonable and efficient use. They also cover interference with utilities, streets, or highways when no reasonable alternative exists, and seriously debilitating disease or danger of falling that reasonable preservation cannot remedy. Removal cannot be in substantial conflict with the purpose and intent of the Oak Tree Permit Process. The findings are listed with mixed “or” and “and” wording, so ask the city which ones apply to a given tree.

Trimming should be limited to the minimum necessary. Whenever possible, trees should remain in place or be moved only the minimum distance needed.

What replacement planting can Pomona require?

The code provision quoted in the staff report requires at minimum a one-to-one replacement with a 36-inch box tree for each removed oak.

Section 1300.J.8.b also allows additional or larger trees and other vegetation as conditions of permit approval. Those added conditions may be used to compensate for the original oaks, aid erosion control, or otherwise protect the environment from the effects of removal.

The pending Garey Avenue case shows how staff may recommend more than the minimum. Staff proposed two replacement trees for each of five oaks and one replacement for each of two smaller oaks. That produced a total of twelve new 36-inch box oak trees.

When a site has no room for the required planting, the staff recommendation says the owner may pay an in-lieu fee to the city. The money would fund planting within city parks or public rights-of-way in the same Council District. The staff report does not state the fee amount.

What happened in the Garey Avenue case?

Pomona staff recommended a Major Oak Tree Permit for seven oak trees at a commercial property on North Garey Avenue, but the Planning Commission’s decision was not available as of November 4, 2026.

The site at 878-898 N. Garey Avenue contains a two-story, multi-tenant commercial building at the southeast corner of North Garey Avenue and East Kingsley Avenue. It is in the Downtown Gateway Segment, T5 transect, of the Pomona Corridors Specific Plan. The staff report identifies a general plan density of 80 dwelling units per acre and a maximum of six floors.

A certified arborist rated five of the seven trees in Good condition and two in Fair condition, with reported diameters from 10 to 36 inches. Staff applied a two-to-one replacement ratio to five trees and one-to-one to the other two, treating five as over 24 inches; the report’s table lists two of those at exactly 24 inches, so ask the city how it counted.

Staff wrote that the trees would significantly limit the footprint of future development and prevent a future housing project from reaching the residential density allowed by the specific plan. Staff also recommended a condition allowing removal only in association with an approved building plan check and site-development permit. That condition was intended to keep the trees in place if development did not occur.

The item was scheduled for the October 28, 2026 Planning Commission meeting. The city’s Planning Commission agenda provides the meeting record. As of November 4, 2026, minutes had not been posted, so check the city’s agenda portal for the eventual outcome.

How do historic district tree guidelines differ?

Pomona’s Tree Preservation Guidelines apply directly to tree removal in historic districts, while staff used their objective method as guidance in the Garey Avenue case even though the property is not in a historic district.

The guidelines use a replacement calculation based on tree type and heritage-tree status, with a retroactive permit factor added when applicable. The maximum replacement ratio is eight to one.

A replacement of the same species, or a tree from the Preferred Tree List, carries a one-to-one tree-type ratio. Another species carries a two-to-one ratio. A removed tree over 24 inches in diameter has its replacement rate doubled as a heritage tree. Diameter at breast height is measured at 4 feet 6 inches.

Within historic districts, a tree on Pomona’s protected species list that meets the listed minimum size requires permission before removal. Staff may act on dead, diseased, or dangerous trees, while healthy trees require Historic Preservation Commission review.

Pomona’s requirements are city-specific, just as the rules covered in the San Dimas tree preservation guide are specific to that city.

What should a buyer check before pricing the property?

A buyer should identify mature oaks, confirm the applicable permit path, and account for possible replacement planting or an in-lieu payment before assigning value to development potential.

Ask whether the property is in a historic district, because that determines whether the Tree Preservation Guidelines apply directly. Review the lot layout against the intended project rather than assuming the trees can be cleared later. The Garey Avenue recommendation also shows that permission to remove trees may be tied to an approved building plan check and development permit.

What should sellers and investors do before removing trees?

Sellers and investors should verify the tree and property rules before authorizing removal, especially when a property is within a historic district.

The historic district guidelines define removal before permission as retroactive approval and double the combined replacement rate. The guidelines describe this retroactive rule for historic districts, and the staff report does not say it applies elsewhere. The staff report also does not state a penalty for removing a mature oak without a permit elsewhere in Pomona.

If prior tree work or removal may not have had the required permission, gather the permit records rather than making assumptions in marketing or project analysis. California sellers can also review the guide to unpermitted work disclosure and the broader California seller disclosure guide.

A Pomona owner told us he intended to remove a mature oak so he could enlarge the driveway. The tree stood entirely on his property, so he assumed no city approval could be required. We asked him to confirm the applicable tree protections before scheduling removal because ownership of the land does not necessarily eliminate local restrictions.

The short version

Removing or relocating a healthy and mature oak tree in Pomona requires a Major Oak Tree Permit under the process described in the Planning Commission staff report.

The permit can involve findings about development constraints, preservation alternatives, utilities, tree condition, erosion, and the purpose of the oak permit process. Replacement starts at a one-to-one ratio with a 36-inch box tree for each removed oak, but additional or larger planting may be required. An in-lieu option may be considered when planting cannot fit on the site.

The seven-tree Garey Avenue case was still pending when this was written on November 4, 2026. Staff recommended approval with twelve replacement oaks and a condition tying removal to an approved development permit, but posted minutes had not confirmed the commission’s decision.

To put the property’s tree constraints in context with its estimated value, start with the home value tool.