The fire danger is high Thursday and the National Weather Service has issued a red flag warning for all of Connecticut.
It has been issued until 8 p.m. because of dry conditions and a lot of wind, according to the state Department of Energy and Environmental Protection.
They said fuels will burn easily today and pose control problems until the winds subside tonight.
Crews in Colchester are battling a brush fire on Prospect Hill Road around half-a-mile into the woods.
South Windsor firefighters trudged through rough terrain to reach a brush fire near Clark Street that scorched about four acres.
In Granby, a brush fire burned three acres and a small outbuilding.
Fire departments across the state are on alert and are asking residents to take precautions.
"Don't light cigarettes outside. Don't do any kind of exterior fires because anything in this weather condition doesn't take long to take off," South Windsor Fire Chief Kevin Cooney said.