The result means the Red Devils are four points clear of nearest rivals Albury United with a round to play and can't be caught.

But it was far from easy for the outfit that has dropped just one match all season and been undefeated at home.

Wangaratta couldn't have asked for a better start after star striker Andrew Barisic found the back of the net inside 30 seconds.

The former A-League player doubled his tally 20 minutes later when Adam Burchell picked him out for a header with a superb cross from the right edge.

Boomers hit back when coach Andrew Grove made no mistake from the penalty spot in the 26th minute.

Six minutes later, Thomas Romero found the reply to make it 3-1 with a brilliant strike to the bottom corner and see the hosts take a handy lead into the break.

Wangaratta looked set to run away with it when Barisic completed his hat trick two minutes into the second half, but again Boomers dug deep.

Kye Halloway's corner kick went into the back of the net untouched in the 57th minute and Noah Spiteri made it 4-3 with a stunning long-range effort dipping under the bar with 25 minutes left to play.

Boomers continued to press, but Wangaratta was able to steady itself and find the sealer when Adam Burchell danced around a number of Boomers defenders and finished to make it 5-3 inside the final 10 minutes in horrible conditions.

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"I'm super proud of the group. Every single week we get teams coming at us trying that much harder to beat us," first-year Wangaratta coach Daniel Vasilevski said.

"The boys have really endured it throughout the season and kept their heads. They've just been so focused on getting the job done.

"At the start of the season we got together and said 'we don't lose at home' and we've done that and we wanted the league and the cup final and it's all we're thinking about right now."

Burchell had a hand in almost every Wangaratta goal in what was one of his best performances in his time at the club.

"It's great to wrap up the league because it shows we've been the best club all year and we've just got to concentrate on finals now," Burchell said.

"A lot of people don't realise there are men and women at this club that have been around for years, working in the canteen, setting up the goals at seven o'clock in the morning.

"That one is for them as well because it's a big, family club and they've been waiting a long time for a bit of silverware."

Wangaratta finishes the league season away to St Pats.