The season for salmon opens on 1st February and closes on the 30th September. It should be noted that the extensions of the season into October, which were introduced on a trial basis a few years ago, have now been discontinued.
Nowadays, the main spring run no longer comes in February. Certainly, some spring fish do still arrive in February, but at present (i.e. over the last decade) the general situation is that the run, or at least the catch per month figure, increases month on month in February, March and April and peaks in May.
Early springers average around 9 lbs, later springers and summer fish can be much heavier, well into double figures.
Similarly, the grilse run has become later, arriving in June to July, with fish averaging 3 or 4 lbs, and going on into late July, August and even into September, given good river levels. Grilse then average around 6 lbs and autumn fish may go into the high teens of pounds.
Given sufficient water, fresh fish will enter the river at most points of the season with the result that, later in the season, the pools may contain an interesting mix of both grilse and large fish up to 20 lbs or more. Overall, at present (relative to the last decade, again) July is more productive than June, August can be excellent given water and can then be more productive than July, and September is often more productive than August, and is indeed quite often the most productive month of the year again depending on conditions, as usual.