The Demons secured second place on the ladder, after a convincing 18 point win against Timboon on Sunday, 0.2 (2) to 2.8 (20).

Horsham coach Terry Arnel said the girls braved the wind, rain and mud to secure victory.

"It was a real experience of the south west on Sunday," Arnel said.

"It was a grind, but the girls fought hard for the win."

The Demons will now prepare for their finals campaign starting on Sunday.

In the competition's previous two seasons, the top two teams have gone straight into a grand final.

But after the addition of another team and an increased level of participation, this season the league's top four will instead enter a three-week finals series.

The Demons face off against minor premiers South Warrnambool in the qualifying final on Sunday, with the winner earning a place in the grand final.

The losing side will move into a preliminary final, where they will face the winner of the elimination final between third and fourth.

"We're pretty proud to have given ourselves the opportunity to take part in finals," Arnel said.

"It will certainly be a test of endurance for the girls across the three weeks."

The Demons first match-up against the South Warrnambool Roosters will be a significant test. The Roosters have won every match this season by an average of 71 points.

"We'll certainly need to be at our best," Arnel said.

"It will be another challenge for the girls - but we will be speaking a lot about taking your opportunities this week.

"Fortunately we've also given ourselves the double chance, so we will at least have two chances to get through to the grand final."

The time and location of the qualifying final on Sunday will be announced later in the week.

Meanwhile the Horsham Saints season wrapped up on Sunday with a 1.0 (6) to 5.8 (38) loss to Terang at Coughlin Park.

The Saints had a difficult season but achieved a significant highlight in round four, when they defeated Timboon by three points for their only win of the season.