Reports of an incident at the park came shortly after 9.15pm on Sunday.
Cleveland Fire Brigade said some rubbish was on fire, with one appliance from Hartlepool attending the incident.
They left the scene just before 10pm.
Cleveland Fire Brigade said: “We were called to a small fire (17/04/2022 at 21.16) on King Oswy Drive in Hartlepool.
"One fire engine was in attendance.
"It involved a small amount of rubbish which was on fire in the play park. Scene was made safe and we left at 21.47.”
This incident comes after a spate of fires in town parks last month.