I don't quite understand the Halibut season fully having only fished for them a couple times. I do know the season is tricky because it goes off of total weight of all halibut caught, it seems sometime in June the season closes while they tally up the weight and then reopen it.
As for salmon, I am just making an assumption here as to fishing them in the ocean (hopefully someone who fishes them more than I do will give you a better idea about this) As the rivers go for salmon we have 2 seasons Spring and Fall. June is a bit in between seasons for salmon, there will be salmon in the rivers but the vast majority of them are going to be dark and soft (not desirable). It's all about water temperature Salmon move into the rivers to spawn and die. I've hooked a bunch of salmon in June and later its not much of a sport. Imagine hooking a boot full of water, that's the fight you can expect.
Now on to the good news, Summer Steelhead will be in full swing on rivers like the Siletz, Nestucca, Wilson.. Google ODFW and read the regs under the fishing section a lot of costal rivers are closed for fishing during the summer to protect the spawning salmon but some have a very strong summer steelhead fishery and are open.
I hope this was helpful
Jer
Sent from my VS985 4G using Tapatalk