With certain exceptions, fishing is open all year. Impoundments are defined as man-made lakes, but the in stream regulation applies to the streams both above and below and impoundment or lake. Confusing isn't it. No person may attempt to take fish by rock or hand fishing, with or without a hook. If you hook a fish anywhere other than in the mouth, you have to let it go unless it is legally caught during snagging season.
Trout are open all year except for areas with special regulations.
Outside of the parks, you have to have a regular fishing license to pursue the trout, but only have to have the additional trout stamp if you intend to keep any of them. I usually get one anyway. They are stocked daily from March 1-October 31 and the daily limit is five. Ask for area specific information when you pick up your daily tag. CnR starts on November 14th.