Kelso's Sevens Tournament takes place annually in May (until recently Kelso along with Selkirk RFC held their 7's competition in August) and the competition is part of the Kings of the Sevens tournament. The most recent winners of the trophy (2013) are Watsonians RFC.
Kelso RFC won the prestigious Melrose Sevens tournament 7 times in the space of 12 years from 1978 to 1989. Kelso were also winners of the Scottish Premiership in 1988 and 1989.
The most recent successes for the club in the 15 a side game were consecutive premier league championships in the 1987/88 and 1988/89 seasons. Notably, however, the team also reached the final of the Scottish Cup, played at Murrayfield, in both 1998 and 1999, losing to Glasgow Hawks (36-14) and to local rivals Gala RFC (8-3), respectively.