The runner-up will receive a $100 voucher from Hebe Fashion Boutique and the third placegetter a bubbly high tea courtesy of Trust House.
To enter, potential contestants need to go to the secretary's office, opposite Castlepoint Store, before race five.
Castlepoint beach racing is regarded as one of the best family days on Wairarapa's social calendar with groups staking out a spot along the beach for picnics.
Refreshments and food will be available at the Castlepoint Store or from The Golden Chip.
The club is asking that people who intend bringing dogs keep the animals on a lead and not to allow them on to the beach itself.
This rule is enforced to avoid injuries to horses, riders and to protect the public.