In Thursday’s rain-affected match, Queensland was sent in and was 2-46 after nine overs when rain hit.
After a lengthy delay, which saw the match reduced to 20 overs per side, Queensland reached 7-124 on the back of 37 runs to Corey Hunter. Kaleb Phillips claimed 2-18 off four overs for ACT/NSW Country.
Chasing a revised total of 131 due to the DLS Method, ACT/NSW Country got home by four wickets with five balls to spare.
Matt Willans claimed 2-15 off four overs for Queensland, but four ACT/NSW Country batsmen passed 20 in an even batting display.
Phillips backed up his bowling effort with 36 not out, while Henry Railz (29), Blake Nikitaras (27) and Matthew Calder (21) also made vital contributions.
South Australia’s campaign ended at the semi-final stage against Queensland after it had won five of the six pool games.
Bailey Capel was SA’s leading run-scorer, his 304 runs headlined by two centuries, and leg-spinner Lloyd Pope was the leading wicket-taker at the Championships with 20 scalps.
Tasmania captain Keegan Oates (430 runs at 71.6) was named Player of the Tournament and was the competition’s leading run-scorer.
NSW Metro trio Oliver Davies (392 at 65.3), Sam Fanning (370 at 74) and Baxter Holt (333 at 55.5), and Victoria Metro’s Will Sutherland (299 at 42.7) also scored heavily.
ACT/NSW Country fast bowler Iain Carlisle (15 wickets at 17.13), Victoria Metro quick Zak Evans (13 wickets at 16.62) and Queensland all-rounder Josh Kann (11 wickets at 18.91) all featured prominently with the ball.
Cricket Australia named a 14-player Australia Under 19s squad for a four-match tour of Sri Lanka.
Pope and New South Wales duo Jack Edwards and Jason Sangha were not considered for selection due to domestic commitments.
The squad is:
Iain Carlisle – New South Wales
Oliver Davies – New South Wales
Zak Evans – Victoria
Sam Fanning – New South Wales
Jarrod Freeman – Tasmania
Lachlan Hearne – New South Wales
Baxter Holt – New South Wales
Corey Hunter – Queensland
Josh Kann – Queensland
Liam Marshall – New South Wales
Keegan Oates – Tasmania
Tanveer Sangha – New South Wales
Will Sutherland – Victoria
Matthew Willans - Queensland