This link had the following info.

https://wdfw.wa.gov/fishing/management/north-falcon/summaries#coastal

Grays Harbor Area
The 2020 recreational salmon fishing season in Grays Harbor (Marine Area 2-2) west of buoy 13 is concurrent with the ocean rules for salmon (Area 2 rules apply). 2020 recreational salmon fishing seasons in Grays Harbor east of buoy 13 are:

North Bay: from Aug. 1 – Sept. 15, anglers can keep one salmon, but must release wild Chinook and wild coho;
East Bay: from Sept. 23 – Nov. 30, anglers can keep one salmon, but must release all Chinook.
Humptulips River recreational salmon fishing season and adult limits for 2020 are as follows:

September: anglers can keep two salmon, and must release wild Chinook and wild coho.
October: anglers can keep one salmon, and must release wild Chinook and wild coho.
November and December: only one hatchery coho may be retained.
During 2020 recreational freshwater salmon seasons for the Chehalis watershed, south bay rivers, and the Hoquiam River, anglers will be able to retain one adult salmon but must release Chinook for the full season and chum during November and December.

Chehalis River from Hwy 101 Bridge to South Elma Bridge: from Aug. 1 – Sept. 15, anglers must release all adult salmon.
Johns, Elk, Hoquiam, Wishkah, Chehalis, Wynoochee, Satsop, and Black rivers will be open October through December, but anglers must release all Chinook in October, and all Chinook and chum in November and December.
The Skookumchuck and Newaukum rivers will open Oct. 16 – December, but anglers must release all Chinook in October and all Chinook and chum in November and December.