You may be refused entry into the United States if you attempt to arrive more than 30 days before OR any time after, the program start date listed on your SEVIS I-20/DS-2019 form.
Make your travel arrangements as soon as possible. Please plan your travel so that you will arrive no later than the date on your I-20/DS-2019 form and admission letter. This will give you ample time to rest before orientation begins.
Please go to this U.S. Immigration and Customs Enforcement Website.