Coho (Silver) Salmon Coho, or Silver Salmon as they are often called, are named for their beautiful silver color. The Coho season begins July 1st, but the run pick's up steam at the end of August through October. Coho in Puget Sound weigh from 3 lbs. to 7 lbs., (these are what we call resident Coho's). The Coho's larger ocean going cousin's weigh from 10 lbs. to 15 lbs. Back