There's the daily poetry contest on lulu:
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While you're still a teen, you can enter the Teen Ink monthly contest:
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Similarly, Creative Communication is dedicated to student writers, and it has a poetry contest three times a year:
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A fair resource for poetry contests is the free newsletter provided by Winning Writers:
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Also Freelance Writing has a pretty current list of writing contests, many of which are for poetry:
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Finally, an excellent resource for poetry competitions in your area is your local library: just go up to the reference desk and talk to a librarian there (not a clerk at the check-out desk!) about poetry contests.