Several trees and tree guards around Stawell were damaged by vandals during the early hours of Sunday morning.

Police believe the damage was caused by a group of people as they made their way down Seaby Street.

Constable Max Mudge of Stawell Police said several wire cages around saplings were damaged along Seaby Street, from Prince Street to Cooper Street. The cages and timber posts supporting the saplings, were damaged on both sides of the street.

Several wire cages and support posts were also damaged along a section of Napier Street. The total cost to the Northern Grampians Shire Council to replace the timber posts and repair the damaged cages was estimated at $700.

"From the appearance of the damage, it looks as though people have been walking along and thrown their bodies into the cages," Constable Mudge said.

"We are appealing to any witnesses who may have seen the damage or heard anything, to come forward with information."

Anyone with information can call Stawell Police on 5358 8222 or Crime Stoppers on 1800 333 000.