No Trespassing Signs California Law: Posting Rules That Actually Hold Up

What California actually requires on a no trespassing sign

California Penal Code 602 handles trespass in a long list of specific circumstances rather than one universal rule, which is why owners get conflicting answers. The posting standard that most enforcement relies on comes from 602(k) and 602.8: signs displayed at intervals of not less than three to the mile along all exterior boundaries and at all roads and trails entering the land, with lettering that is legible — commonly read as at least two inches high for the words 'No Trespassing'.

For a fenced commercial lot, an apartment community, or a construction site, the practical requirement is simpler: a reasonable person walking or driving toward any normal entry point must see a sign before they are inside. Courts and responding officers care about notice, and notice is a question of placement far more than a question of sign design.

• Wording'No Trespassing' plus, ideally, the code section and the owner or agent name.
• Letter heightTwo inches or larger for the headline words; readable from the approach.
• SpacingAt least three signs per mile of boundary, plus one at every road, gate and trail.
• Height & facingRoughly five feet, facing outward toward the approach, unobstructed by growth.
• ConditionFaded, tagged or fallen signs are treated as no sign at all. Photograph them annually.

Penal Code 602 vs 602.8 — and why the difference matters at 2 a.m.

602.8 covers entering posted or fenced land without permission and is an infraction for a first offence, escalating on repeat violations. 602 covers the aggravated conduct owners actually call about: refusing to leave after being asked, occupying a structure, damaging property, or returning after a warning. Signage supports both, but it does far more work under 602.8, where being 'posted' is an element rather than context.

This is why we tell clients that signage is step one and documentation is step two. A sign gives the officer the notice element; your patrol log, timestamped photos and prior warning records give them the repeat-offender element that turns a citation into something that stops the behaviour.

The 602(k) letter of agency most owners never file

Under Penal Code 602(k), a property owner can file a written letter of authority with the local law enforcement agency naming an agent — including your security provider — who may act on the owner's behalf to request that a trespasser leave. Where a department accepts these, officers can enforce without waiting for the owner to be reached at 3 a.m.

Sacramento-area agencies handle this differently, and some require an annual renewal or a specific form. We help clients prepare and file the letter, then keep a copy in the post orders so the officer on your property can show it when a patrol unit arrives.

• Who filesThe owner or an authorised officer of the ownership entity, not the tenant.
• What it namesThe property, the term, and the agents authorised to give the trespass warning.
• Where it goesThe police department or sheriff's substation with jurisdiction over the parcel.
• RenewalCommonly annual — set a calendar reminder; an expired letter is not enforceable.

Why signs alone stop almost nothing — and what to pair them with

Signage is a legal instrument, not a deterrent. Encampments, catalytic converter crews and copper thieves are not reading your placard and reconsidering. What signage does is remove the 'I didn't know' defence and give a responding officer a lawful basis to act quickly.

The pairing that actually changes outcomes on Sacramento-area properties is posted boundaries, a filed 602(k) letter, randomized marked patrol passes with GPS-verified checkpoints, and a written log that shows the same individual returning. That package is what converts a repeat trespass problem into an enforceable one.

• Post the boundaryEvery road, gate, trail and pedestrian cut-through, facing outward.
• File the 602(k)Name your patrol provider as an authorised agent where the agency accepts it.
• Log every contactTime, location, description, photo, and whether a warning was given.
• Patrol unpredictablyVaried pass times so the property never reads as unwatched.

Signs posted and still getting hit?

We patrol posted properties across Sacramento, Placer and Yolo counties with GPS-verified passes and a written contact log that police can use. Call 1-800-823-5337 for a same-week start.