Techniques for implicit indication of trigger frame start times are described. In various embodiments, an AP may be configured to transmit a trigger frame at the beginning of each target wake time (TWT) interval. In some embodiments, each STA that uses a given TWT interval may be configured to treat a TWT Start Time received from the AP not only as a start time for that TWT interval but also as a start time for the trigger frame to be received from the AP. In various embodiments, each STA in a TWT Group may wait to receive the trigger frame from the AP upon awakening during its TWT interval. The embodiments are not limited in this context.