In an update this morning (June 2), Lancashire Fire and Rescue Service said crews had remained at the scene of both wildfires overnight to keep watch.
They will remain at both sites today to monitor for flare-ups and dampen down any hot spots.
A spokesman for LFRS said: "The fire on Darwen Moor is now under control. At 8 am this morning, eight fire engines will be at the scene and firefighters will be damping down hots spots.
"Three fire engines are at Longridge Fell and firefighters there are maintaining a watching brief this morning.
"The fire has been largely extinguished."
An investigation is ongoing into the cause of the fire on Longridge Fell.
The LFRS spokesman added: "We have come across evidence of several campfires although these are not responsible for starting this fire.
"Firefighters have been working closely with the landowners and their help has been invaluable."
The fire service has already established that the Darwen Moor fire had been accidentally caused by a disposable BBQ.
Two men, aged in their 20s, have been identified by police in connection with the fire.
Lancashire Police said the men had self-reported the fire after it spread rapidly on dry grass at around 7pm on Saturday (May 30).
It said the men "will be spoken with at a later date."