Both parks will open to passholders and members before welcoming the general public on April 3.
The parks have not been open with rides or attractions since March 2020.
Contrary to early reports, California's theme park industry is not recommending a ban on screaming on thrill rides.
Disney CEO Bob Chapek said the resort will need time to call back and retrain thousands of Disneyland employees.
This will be guests' first chance to step inside the theme park since last March's COVID-19 shutdown.
Cedar Fair says it will fill 45,000 seasonal positions across its parks for the 2021 season.