Grape seeds require a period of cold, moist conditions to begin the germination process. In nature, this is achieved when seeds sit in the ground over the winter. You can mimic these conditions through the process of stratification. For grape seeds, the best time to begin stratification is in July-August (in Australia)

If you want to try to germinate the seeds now, I recommend using the fridge as the following step to create a similar condition for the seeds:

Soak your seeds for 24hrs.

Prepare a bed for your seeds. Fill an airtight bag or other capsule with a soft medium like wet paper towels or sand, vermiculite or peat moss that has been dampened.

Tuck the seeds into the bed. Cover them with about 1/2" (1.25 cm) of growing medium.

Refrigerate the seeds. The ideal temperature for stratification is a steady 35-40 ºF (1-3 ºC), so the refrigerator is a good place for this process. Keep the seeds refrigerated for three to four weeks. Do not allow them to freeze.

Your seeds should be at their best condition to germinate after refrigeration. Plant them normally in the soil. It should germinate around 2-3 weeks.

Please note I still recommend to plant the seeds follow it natural process which is in winter. Keep them in the refrigerator for a month and plant in early spring to achieve the best result.

Happy growing.