Thomson said it had been fantastic to see its growth.
"As we approach the kick-off of our fourth season, we are excited to be back, bigger and better than last year. Over the winter months everyone has been busy organising all the logistics in the background. It's amazing to see the growth of Surfing for Farmers running in 21 locations all over New Zealand coastlines."
He said the mental health of those in the rural community continues to be a problem.
"It's been heartening to get such positive feedback from farmers and growers, who tell us what a difference getting off the farm and into the surf can make."
Thomson is keen to see numbers grow even further this summer.
"Surfing for Farmers is for everyone. We hope our regulars will pick up a neighbour and bring them down. And for first-timers - come and have a go."
Surfing for Farmers will be held at Sandy Bay on January 12 at 5.30pm and at Waipū Cove from 5.30pm on January 13.
For more information, go to surfingforfarmers.com.