Thorpe Park is charging up to £25 for holders of its season passes and the standard Merlin annual pass.
Pass-holder prices for the event, which runs from 9 October to 1 November, start at £10 on quieter days.
They rise to up to £25 during peak weekend days, and the half-term week at the end of October.
Holders of Merlin Entertainment’s premium annual pass pay £1 for all nights of the Halloween event.
Like all theme parks in the UK, Thorpe Park has been operating at reduced capacity since reopening in July, in order to facilitate COVID-19 social distancing.
Pass-holder fees are a usual feature of the Fright Nights event, but the £25 charge is the highest in the event’s history.