The timing of your trustee's first notice to your beneficiaries depends on what kind of trust you've established. If the trust is revocable, the trustee would typically be your successor trustee, taking over the reins of the trust at the time of your death. If it's irrevocable, he steps in to assume control as soon as you establish the trust. In the case of a revocable trust, your trustee must immediately notify your beneficiaries of your death. If you form an irrevocable trust, he typically has a responsibility to let your beneficiaries know that the trust exists within a certain period of time after he accepts appointment. Specific time limits for giving notice depend on individual state laws.
Revocable and irrevocable trust beneficiaries have a right to request copies of a trust's formation documents as well as any amendments when you die. Your beneficiaries usually will not receive this paperwork automatically – they must ask for it. Some states, such as California, have specific deadlines – such as 60 days – by which your trustee must respond to the request. With or without a deadline, the trustee is obligated by law to comply.