There are wonderful match play and tournament opportunities for Junior Tennis players that are available year-round.
Atlanta, GA: Junior match play organizations & tournaments are numerous
Dallas, TX: Junior match play organizations are limited. However, there are lots of tournament opportunities.
Junior Match Play www.juniormatchplay.com
Netlineup Tennis League www.netlineup.com
T2 Tennis - the flexible way to play www.t2tennis.com
USTA - Junior Tennis http://www.usta.com/Youth-Tennis/JuniorTournaments/