Do I need a green dot permit to drive my jeep on green dot roads? I was told I didn't need one where I get my fishing license, but I'm not so sure.

I'm not aware of any green dot permit.
You should have received a land use permit with your fishing license. As far as I know that's the only permit you need to access any Washington public land open to vehicles.
The green dot system is simply a marker system to let you know that a road is open to vehicular traffic.
Vehicle Use Permit Information - Wash...& Wildlife

Vehicle Use Permit Information - Wash...& Wildlife

ORV Trail Watch • View topic...ot Road System

soundline. i just got my 1st jeep a month ago, still all stock. i'am going to go up north fork tampico this sat. with 3 of my kids. staying on logging roads, maybe a few detours up some green dots. nothing serious. i know that neck of the woods pretty well. are you game?

Too bad I just got this now. I've been roped into going to Vantage today, which is going to be stellar in the rain.

Thanks for the invite.

if you get a chance let me know what it was like I've never been off road in the vantage area. tampico was o.k. it just isn't as much fun when you have to have the top on. and i also found out i really need some better tires.