Multiple yacht clubs across Perth hold invitational racing throughout the winter season (May to September). You don't need to be a member of the yacht club to participate, but you are required to register.

Here is a list of some Winter Series racing available for the Optimist class:

Fremantle Sailing Club 

1. Sat 17 May
2. Sat 14 June
3. Sat 26 July
4. Sat 16 August

Hillarys Yacht Club

1. Sat 7th June
2. Sat 21st June
3. Sat 26th July
4. Sat 9th August
5. Sat 23rd August

Nedlands Yacht Club

1. Sun 15 June
2. Sun 20 July
3. Sun 17 August 
4. Sun 14 September

Royal Freshwater Bay Yacht Club

1. Sun 25 May
2. Sun 8 June
3. Sun 22 June
4. Sun 20 July
5. Sun 17 August
6. Sun 7 September

Royal Perth Yacht Club

1. N/A

South of Perth Yacht Club

1. Sun 18th May
2. Sun 15th June
3. Sun 29th June
4. Sun 13th July
5. Sun 27th July
6. Sun 10th August
7. Sun 24th August

Mandurah Offshore Fishing and  Sailing Club

1. Sunday 8th June
2. Sunday 22nd June
3. Sunday 6th July
4. Sunday 20th July
5. Sunday 3rd August
6. Sunday 17th August