Short answer is sometimes yes, sometimes no and a lot of homeowners find that out the hard way, after the tree’s already on the ground.

Portland has rules about which trees you can remove freely and which ones need a permit first. Most people assume “it’s my yard, it’s my tree, I can do what I want.” That’s actually not how it works here, and the rules catch people off guard more often than you’d think.

Here’s the simple version.

The size of your tree matters more than you’d expect

If your tree’s trunk is 12 inches or wider (measured about 4.5 feet up from the ground), you generally need a permit before removing it.

That’s it. That’s the main rule for most private property trees. Smaller than that? In most cases, you’re fine to remove it without asking anyone.

A few quick things worth knowing:

• The measurement is taken at chest height, not at the base of the trunk
• Trees in certain historic or environmentally sensitive areas can require a permit even if they’re smaller
• Some species, like Oregon white oak or Pacific dogwood have a lower size threshold, around 6 inches

If you’re not sure how wide your tree actually is, this is one of those things worth having an arborist check before you do anything.

What if the tree is right at the street?

Any tree growing in the strip between the sidewalk and the street what the city calls a “street tree” needs a permit to remove, no matter how small it is.

Even if it’s technically on the edge of your property, if it’s in that strip, it belongs to the city’s tree rules, not yours.

“But my tree is dead and clearly dangerous”

This is the one that trips people up the most.

If a tree is dead, dying, or actively hazardous, you can usually still get a permit approved fairly easily, Portland’s code is built to let homeowners deal with genuinely dangerous trees. You still need to apply, you just don’t have to fight as hard for approval.

If the tree is a true emergency, actively cracking, falling, or blocking a street right now — the city does allow you to remove the hazardous part immediately, before paperwork. But you’re expected to apply for a retroactive permit within about a week afterward, with some kind of proof it really was urgent. A few photos or a quick note from an arborist usually does it.

The mistake people make is assuming “it looked dangerous to me” is good enough on its own, skipping the paperwork entirely, and hoping nobody notices. That’s the version that ends in a fine.

Do you have to plant a new tree after removing one?

Often, yes. If your removed tree needed a permit, Portland typically asks you to plant a replacement on the property or in some cases pay a fee instead, if there’s genuinely no room.

It doesn’t have to go back exactly where the old one was and you’ve got some flexibility in species, but the idea is simple: the city wants the overall tree canopy to stay roughly balanced over time, not shrink with every removal.

What happens if you skip the permit?

Fines, mostly and the city can still require you to plant a replacement tree after the fact, so you don’t actually avoid the requirement, you just add a penalty on top of it.

It’s one of those situations where the permit itself is usually pretty straightforward but skipping it turns a simple process into an expensive one.

The easiest way to know where you stand

Honestly, the fastest way to figure out if your tree needs a permit is to have someone measure it and take a look at your property’s zoning. It takes a few minutes, and it’s a lot less hassle than removing a tree first and finding out afterward that you needed paperwork.

If you’re in the Portland area and want to know whether your tree needs a permit or just want an honest opinion on whether it needs to come down at all, we’re happy to take a look. We’ve been navigating Portland’s tree rules for over 30 years and can usually tell you where you stand on the spot.