Firefighters are conducting burning-out operations around Grampians National Park to prepare for difficult conditions expected next week.
Three fires are currently burning in the park, with two of particular concern in the northern and southern regions.
Multiple watch and act warnings are in place for communities, including Mooralla, Woohlpooer, and Victoria Valley.
The fires, started by lightning strikes, have significantly grown in size since the start of the week.
Temperatures are set to rise, reaching 37°C on Sunday and Monday, and 38°C on Tuesday, creating dangerous fire conditions.
Firefighters are using aircraft and burning-out operations to contain fires in remote, steep terrain.
Crews will carry out burning operations on both private and public land to prevent the fire from spreading uncontrollably.
A wind shifts from southerly to northerly on Monday could push fires toward communities in southern Grampians.
The historic town of Cavendish is a particular concern due to its proximity to the fire.
Meanwhile, another blaze in Little Desert National Park has grown to 70,000 hectares, destroying at least one home and a popular wedding venue.
A watch and act alert has been issued for several areas, warning residents to stay prepared for changing conditions.
