East Sussex fire chiefs believe the Easter holidays and clement weather have prompted a rise in the number of arson attacks.
Firefighters have attended 61 blazes throughout the county since last Friday, mainly in rubbish bins and on open land.
Bruce Hoad, the brigade's director of community protection, said youngsters were possibly to blame.
He urged parents to know what their children were up to during the holidays and to keep lighters and matches out of their reach.
Mr Hoad said: "We usually see an increase in the number of deliberately-started outdoor fires during school holidays.
"With the lovely weather we've been enjoying, it makes a dangerous combination.
"It will only be a matter of time before one of these fires gets out of control and puts lives and properties at risk."
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