The incident occurred in Westport around 2:50 p.m. Monday, March 11, south of Exit 42, Connecticut State Police said.
The three vehicles, a Toyota Corolla, a Toyota Sienna, and a Nissan Altima, were traveling south on the parkway in the right lane when the tree fell, hitting the top of the first two vehicles.
The third vehicle hit the tree as it fell in the roadway, state police added.
Minor injuries were reported. All three vehicles received "disabling" damage.
A 56-year-old Westport woman in the Sienna was transported to Norwalk Hospital with suspected minor injuries.
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