The River Thurso is one of the best salmon rivers in Scotland, and is currently enjoying very good numbers of grilse and salmon, with runs averaging in excess of 1700 Salmon per year. In 2017 the river recorded 1745 salmon from beats 2 to 13. The season starts on the 11th January and runs through to 5th October, although fish are taken in January and February, the season really starts to get underway in the middle of March when the spring run starts. The spring run peaks in May but continues through to early June. The grilse start to arrive in late May with the peak of the run in late July/ early August. In September there is a small run of larger summer salmon.