Athletics events will begin on July 31, with Tokyo 2020 stating finals will feature in almost all sessions.
Nine of athletics finals will take place during the morning sessions.
“Having finals in the morning, as requested by the International Olympic Committee, will enhance the visibility of athletics across all time zones," said Paul Hardy, IAAF competition director.
"The stadium-based distance events remain in the evening sessions to reduce the risk of very hot conditions for our endurance athletes, while the road events will start as early as practicable in the morning.
“The new schedule also accommodates both the traditional doubles and the historic addition of the mixed 4 X 400m relay, the first time that athletics has combined the talents of both male and female athletes in one event at the Games.”
The marathon start times has been the subject of debate in recent months, with the IOC and Tokyo 2020 starting in December that recommendations had been made to help combat potentially high temperatures.
Concerns were particularly raised with regard to marathons, with both the Japan Medical Association and the Tokyo Medical Association calling for start times to be moved to 5:30am.
They argued the decision from the IOC and Tokyo 2020 organisers to move the starts time up 30 minutes to 7:00am was insufficient and could prove a health risk to spectators and athletes.
The competition scheduled reveals both the men’s and women’s marathon are due to begin at 6:00am local time.
Tokyo 2020 state they took a “holistic approach” when compiling the schedule, taking into account the technical rules and regulations of the various international federations, gender balance, athletes’ experience and well-being.