According to the Disneyland Resort park hour calendar starting July 1 2021 both Disneyland Park and Disney’s California Adventure will see park hours extended. Currently both parks are operating from 9am until 9pm.
Starting July 1 2021 Disneyland Park will see 2 extra park hours added (one hour in the morning and one hour in the evening) whilst Disney’s California adventure will only see an extra hour (in the morning). So starting July 1 2021 the new park hours will be:
Disneyland Park: 8am – 10pm
Disney’s California Adventure: 8am – 9pm