The Fire Service of Northern Ireland said there was a decrease in the number of call-outs on the eve of 12 July commemorations.
A total of 30 calls were received between 6pm last night and 1am - a reduction on the 44 last year and 54 during 2013.
The fires are an annual tradition ahead of the "Twelfth of July" - the high-point of the Orange Order marching season.
One of the largest fires, in New Mossley, Co Antrim, collapsed soon after it was ignited, but there were no reports of any injuries.
A spokesman said more than 30 firefighters helped to protect homes at Chobham Street in east Belfast.
A number of families living in the area moved out of their homes this week after warnings that their lives and homes could be in danger.
The people who built the bonfire had refused to move it elsewhere.
More bonfires are expected to be lit tonight ahead of the Orange Order parades tomorrow.
