A boat that was destroyed by fire in Queenstown last night has been deemed suspicious, fire services say.

Southern fire communications shift manager Rachel Butler said fire services received a call alerting them to the incident at 4.13am.

She said the Frankton fire service responded and found a boat was on fire at Lake Avenue in Queenstown.

"When they arrived it was well involved, so the boat was fully involved in fire."

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She said the fire has since been extinguished.

The fire is deemed to be suspicious and fire investigators are currently at the scene, she said.