A storage shed at Thames Golf Club was the target of a suspicious blaze early today.
Waikato fire and emergency investigator Kevin Holmes said the 6m x 10m shed stored four golf carts, a tractor and fairway mower.
Firefighters were called to the club on State Highway 26 at 2.40am today.
The shed is about 150m from the road and clubhouse, he said.
The fire is being treated as suspicious as the shed didn't have power.
The golf carts have been completely destroyed, and the tractor badly damaged.
Holmes and local police will today investigate the cause.