About 400 people attended the 10th annual Horsham Mother's Day Classic, which involved a 4km walk or 8km run.

Event organiser Jackie Exell said it was great see a strong crowd.

"We were really rapt with the turn out and our online registrations were higher than they have been before," she said.

"It was just the weather that kept some people away on the day and we had a few little showers, but it didn't stop people participating."

Ms Exell said past committee members were invited back to this year's classic to celebrate its 10th anniversary.

"We wanted to acknowledge the hard work and dedication everyone has done over the years," she said.

"The feedback we got from people was that the event wasn't just continuing each year, it was growing."

The Horsham Mother's Day Classic raises money for breast cancer research.

Ms Exell said it was an important cause for the region.

"You would be hard pressed to find someone in the community who hadn't been affected by breast cancer in some way," she said.

"Everyone has a friend or a family member who has been diagnosed.

"All the money raised goes to research, so hopefully in a generation or two we can stop more people dying from breast cancer, if not eradicate the disease completely."

Ms Exell said people could still donate to the event until July.