Refurbishment works are to take place at the Ashton Memorial and Butterfly House in Williamson Park over the winter period.
Work taking place to the Butterfly House includes internal repairs and restoration to the roof of the Grade II listed building.
Internal refurbishments are also taking place to the inner dome of the Grade I Ashton Memorial and it will be closed from November 21 until April 2017.
Lancaster City Council said any buildings of their age that suffer from wear and tear need to be regularly maintained and undergo routine maintenance to ensure they can continue to be used.
.Some work has already been done to the exterior of the butterfly house, which has had scaffolding up for some time, and now the interior will be worked on.
Every year there is a schedule of repairs to municipal buildings, and the Ashton Memorial is one of those buildings. The money for the repairs comes from the capital works budget.
As a result of the refurbishment works, access to the Butterfly House will be restricted from November 5 to February 2017, but all the other attractions including the meerkats, small mammals, aviary and mini beasts, will remain open.
The park’s annual Christmas carol concerts have been relocated to The Storey in Lancaster as a result.
Coun Brendan Hughes, Cabinet member with responsibility for parks and open spaces, said: “The city council is custodian of these two great buildings and these works are necessary for their continued use and enjoyment by the public.”