2015 WA State Challenge Cup
soccer clubs competed in 2015 for the Football West State Cup, known for sponsorship reasons as the Cool Ridge Cup. Clubs entered from the National Premier Leagues WA, the two divisions of the State League, a limited number of teams from various divisions of the 2015 Amateur League competition, and from regional teams invited from the South West, Goldfields, Great Southern and Midwest regions. This knockout competition was won by Sorrento FC, their third title.
The competition also served as the Western Australian Preliminary Rounds for the 2015 FFA Cup. The two finalists – Perth SC and Sorrento FC – qualified for the final rounds, entering at the Round of 32.
Schedule
A total of 61 teams took part in the competition, from Perth-based and regional-based competitions.| Round | Main dates | Number of fixtures | Clubs | New entries this round | Levels of new entrants |
| 14–15 Mar | 8 + 7 byes | 61 → 53 | 23 | Amateur League lower Divisions; regional teams from Midwest, Goldfields, Great Southern and South West Soccer Associations | |
| Round 3 | 28–29 Mar | 21 | 53 → 32 | 27 | Football West State League Division 1; Football West State League Division 2; Amateur League Premier Division |
| Round 4 | 6 Apr | 16 | 32 → 16 | 11 | National Premier Leagues WA |
| Round 5 | 27 Apr | 8 | 16 → 8 | none | |
| Round 6 | 1 Jun | 4 | 8 → 4 | none | |
| Round 7 | 20–21 Jun | 2 | 4 → 2 | none | |
| Final | 1 | 2 → 1 | none |
Second round
The round numbers conform to a common format throughout the 2015 FFA Cup preliminary rounds. A total of 23 teams took part in this stage of the competition, from lower divisions of the Amateur League, and from regional teams invited from the South West, Goldfields, Great Southern and Midwest regions. Matches in this round were played by 15 March 2015.| Tie no | Home team | Score | Away team |
| 1 | Batavia United | 0–3 | Chapman Athletic |
| 2 | Geraldton Rovers | 1–3 | Olympic Heat |
| 3 | Twin City Saints | 2–1 | Boulder City |
| 4 | North Lake | 5–0 | La Fiamma |
| Tie no | Home team | Score | Away team |
| 5 | Margaret River | 0–2 | Jaguar FC |
| 6 | Bunbury Dynamos | 7–2 | Albany Bayswater |
| 7 | Challenger FC | 0–14 | Ballajura AFC |
| 8 | Cracovia White Eagles | 4–2 | Carramar FC |
- Byes – Backpackers FC, Busselton SC, East Fremantle, Eaton Dardanup, Emerald FC, Maccabi SC, Perth Saints.
Third round
;Notes:
- † = After Extra Time
- Fremantle United Soccer Club and the East Fremantle Tricolore Soccer Club are now in a joint venture arrangement to form a new club called Fremantle City Football Club Two separate teams have entered into the FFA Cup competition.
Fourth round
| Tie no | Home team | Score | Away team |
| 1 | Armadale | 2–1 | Shamrock Rovers Perth |
| 2 | Joondalup United | 0–2 | Ashfield |
| 3 | Busselton | 0–5 | Bayswater City |
| 4 | Gwelup Croatia | 6–0 | Cracovia White Eagles |
| 5 | Cockburn City | 11–1 | North Lake |
| 6 | Floreat Athena | 0–3 | Perth SC |
| 7 | Balcatta | 2–1 | Rockingham City |
| 8 | Fremantle City | 3–1 | Curtin University |
;Notes:
- † = After Extra Time
Fifth round
| Tie no | Home team | Score | Away team |
| 1 | BB United | 1–2 | Gwelup Croatia |
| 2 | Cockburn City | 3–0 | Ashfield |
| 3 | Balcatta | 0–2 | Subiaco AFC |
| 4 | Fremantle City | 0–2 | Perth SC |
| Tie no | Home team | Score | Away team |
| 5 | Mandurah City | 6–4 | Joondalup City |
| 6 | Inglewood United | 0–2 | Bayswater City |
| 7 | South West Phoenix | 4–1 | Armadale |
| 8 | Sorrento | 5–1 | Stirling Lions |
Sixth round
A total of 8 teams took part in this stage of the competition. The draw took place on 28 April. Matches in this round were played on 1 June 2015.| Tie no | Home team | Score | Away team |
| 1 | Cockburn City | 1–2 | Bayswater City |
| 2 | Perth SC | 1–0 | Subiaco AFC |
| 3 | Mandurah City | 1–4 | Gwelup Croatia |
| 4 | Sorrento | 4–0 | South West Phoenix |
Seventh round
A total of 4 teams took part in this stage of the competition. The draw took place on 2 June. Matches in this round were played by 21 June 2015. The two victorious teams in this round qualify for the 2015 FFA Cup Round of 32.;Notes:
- † = After Extra Time
Final