The Fire and Rescue Service received nearly 500 calls during last night's Halloween celebrations - one every 45 seconds over a seven-hour period.
Gorse blazes and bonfires accounted for most of the incidents - though numbers were slightly down on last year when fire crews were called out to 540 incidents.
In the most serious incident, eight cars were damaged in a fire at a garage on the Ballynakilly Road in Coalisland. And five appliances were called out to deal with a fire at a derelict social club at Peter's Hill in Belfast.
More than 40% of calls originated from the south-east of the province.
Alastair Reid, from the Fire and Rescue Service, told the BBC that while there was a significant number of call-outs to deliberately lit fires, he was happy to report that no firefighters came under attack. In the past, fire crews have been attacked by youths in parts of the city.
"What I am pleased to say is that there were no injuries reported last night," Mr Reid told the BBC.
Meanwhile, last night's fireworks display in the city centre went off without a hitch. Around 12,000 people gathered at the Odyssey car park to watch the display.
Belfast Lord Mayor Jim Rodgers said "It was great to see so many people from all religions, colours and ethnicity. It really made for a wonderful atmosphere and shows just how much Belfast has moved forward. "