Manx National Heritage says the Chasms will stay closed to climbers until at least July 14 this year.
The organisation says Choughs which nest on the cliffs have done so late this year, meaning the protected birds can’t be disturbed.
The Sugar Loaf and the Anvil will be closed until July 31.
MNH says it has a duty to protect the birds on its land, and it’s an offence under the Wildlife Act 1990 to disturb the birds, their nests or their young.
Crime on the Island continues to fall while serious incidents create 'exceptional demand'
Chief Constable Russ Foster's Annual Report published
As heatwave heads our way, how do we stay safe in the sun?
Island could reach 27 Celsius on Thursday
Cost of a passport set to increase this summer
Treasury says higher fees will mirror fees introduced in the UK earlier this year
Manx Telecom to fund groundwork for fibre customers
Company says it's removing 'practical barrier'
Water quality in Peel to improve ahead of 2027 bathing season
But screening equipment will be operational by this September