I've lived in Western Washington for 60 years much of it outdoors throughout the Cascades and Olympics and I've never run into.

I'm not saying it's not here, that's just my own experience for what it's worth

I’ve seen it but only rarely. There’s a patch in Seaward Park in Seattle.

In Olympia at least there are signs in some parks saying to stay on the trail because of poison oak

There is poison hemlock in QA, Interbay, and Magnolia for sure.

Squaxin Park, formally Priest Point Park comes to mind.

in my experience its most common along river valleys in the columbia gorge. hood river, white salmon, klickitat all have poison ok.

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east of the mountains its mostly posion ivy and it is easy to ID.

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if your on the OP or the higher elevations or further north in the cascades its pretty rare.

You’re fairly safe from it. You’ll definitely get into some stinging nettles, but that’s nothing compared to poison oak/ivy - plus it’s edible :D

It's around for sure. Not as common as in places like coastal California though.

I got it reaaal bad in Bellingham while hiking up from Teddy Bear Cove in 2013/2014. It was the worst ever. Be careful!

I've never seen it on the Olympic Peninsula, nor the North Cascades.

I found some on McMicken Island in the South Sound. It likes dry western exposures with minimal tree cover.

While living in TX I accidentally weed-whacked myself through a patch of poison ivy. In shorts. It was bad 😂

Never seen either oak, ivy, or sumac up here over the past twenty+ years.

And so delicious!

I've found that if you're in an area that has oak trees, there's likely to be poison oak as well. Oaks aren't super common in Bellingham but they do grow up there. You're going to find more oaks as you go south in washington.

Yeah there’s some stinging nettle but poison oak and poison ivy are definitely less common. I have worked outside landscaping a fair bit and only once or twice saw poison oak

I got into some poison oak around in the South Sound area near Steamboat Island / Olympia but haven’t come across it myself anywhere else since and that was 20+ years ago. It was along a trail going down to salt water.

Had it bad as a kid growing up in the SW Washington Vancouver area but just the once. I believe it was poison ivy. Big pus filled welts.

I've never come across it in all the time I've been here, and gone through various parks in Seattle, Olympia and the Olympic Peninsula. I'm sure there is some, but I've never come across it in any of my walks.

I’ve seen it on Maury island.

https://wsdot.wa.gov/sites/default/files/2021-10/Env-Wet-PoisonousPlantsBooklet_WEBversion.pdf

Nettles are everywhere on hiking trails. Look for spade shaped leaves with serrated edges.

There is poison sumac in the southwester area.

Sweet going to read this!

I had no idea, I love learning new things!!!!

Discovered (the hard way) several patches of poison oak on some property I was clearing of invasive plants. Key Peninsula, near Lakebay/Home. Wetland/disturbed/heavy clay soil.

YES. Especially around the Puget Sound shoreline and islands.

You can extinguish nettle stings with fern juice.

Yep. Poison Ivy/Oak will definitely fuck you up. It’s not like nettles. The toxin spreads all over your body.

Fern juice will kill nettle stings. Bracken fern is best, sword fern will do the trick as a 2nd place.

Also between Vashon Hwy and the beach west of Burton.

my first home in WA was near the center of vashon island and we had poison oak in the woods behind our house. made me think it was commonplace but apparently it isn't so much. i've seen some on the side of the road near the south end ferry dock as well.

It’s on the rise as an invasive species. Seems to hitchhike in potted cultivars from the requests I’ve seen people make trying to identify it in various weed control groups on the internet.