Prime brown trout time is probably May and June into early July.
The sea trout and salmon (nearly all grilse) come into the system on the second spring tide of July, and it is this early run that includes some of the biggest fish.

Runs tend to be pretty consistent through August, September and October; all of course subject to water.

* 2007 season produced 504 sea trout and over 90 salmon. The heaviest sea trout weighed 9.75lbs and there were many over 5lbs landed. Brown trout caught numbered over 1,300 with many in the 2 - 4lb range the heaviest being 4.75lbs

Note also that the brown trout fishing picks up again in September as the fish pack on weight for spawning.