Firefighters have contained a grass fire in Molonglo Valley overnight.

At about 7.30pm, ACT Fire and Rescue responded to reports of a grass fire near the Yarramundi Cultural Centre on Lady Denman Drive.

Firefighters arrived to find a grass fire about 100mx100m in size.

Several resources from ACT Fire and Rescue and ACT Rural Fire Service responded to the scene.

The fire was quickly contained after 30 minutes and firefighters remained on scene blacking out the fire until 9.30pm.

ACT Policing were also in attendance.