Test dates are available on the TOEFL website. The regular registration deadline is 7 full days prior to the test date. The late registration deadline is 4 business days prior to the test date, or 1 business day before the test date if you register by phone.

For example, if your test date is Saturday,
October 13, the deadline to register online without a late fee is Saturday,
October 6. If you register by mail, your registration form and payment must be received at least 4 weeks before your earliest test date
choice. Testing start times vary; your specific start time will be in your registration confirmation.