Generally, yes, but it is restricted. To be safe, within 6 months of your High School graduation date, you receive a grace period, which allows you to play as much as you want (NCAA Division I). Some sports and NCAA Division II colleges still may offer a 1-year grace period. If you compete in any organized competition after your grace period is over, you automatically become subject to losing a year of NCAA eligibility!! However, it is strongly advised that if you do participate in organized competition to always register as an amateur.
20-Year Age Rule for Division I NCAA (minority number of sports still apply the 21-Year Age Rule).
In Division I only, if a student-athlete has participated as an individual or as a team representative in organized sports competition (that kind of participation during each 12-month period after his/her 20st birthday and prior to initial full-time collegiate enrollment) will count as one forfeited year of varsity competition in that sport. Any participation in organized competition during time spent in the U.S. Armed Services will be accepted.
The NCAA and the NAIA both offer "resources" on their respective websites with the exact regulations covering all amateurism related questions. Those rules have changed as recent as Summer 2012. You can also contact us for further information. All our clients always receive the most up-to-date information, as we constantly keep track with the ever-changing regulations of the NCAA and NAIA.