As we change into a fall fishing pattern there are several things that fishermen can do to increase there catch through out the day. That may be slightly different than the techniques that they were using for summer time fish.
Fishing is good throughout the day, you do not have to fish early or late. Trout will feed all day as they are trying to feed up for the winter, and for spawning in late November in our part of the country.
Terrestrials are a very good fly to use in the fall. However fishing an ant or beetle or hopper in the early morning when it is cool and they are not as active is probably not going to produce as many fish as if you fished the same fly later in the day.
Go big or go home, large trout especially browns like to make a good meal out of eating smaller fish this is especially true in the fall a large trout is capable of eating another trout half his size. So fish large streamers yes even in clear water for larger browns and rainbows.
Fishing dark colored mayfly nymphs and caddis pupas in the morning are a good choice. Then transition to the dries as the day warms up.
Do not be afraid to impair action to your fly until the water gets below 50 degrees. Fall trout tend to more aggressive, so skating flies, stripping flies, or adding some type of movement to your fly may result in more aggressive strikes.