West Kelowna Fire Rescue received multiple calls of visible smoke and flame in the Glenrosa area around 12:30 Monday afternoon.
Upon arrival to Gates Road, crews found four cars engulfed in flames, with the fire spreading to the grass and threatening nearby forests.
A total of six cars were burned in the blaze before the fire was brought under control.
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Two initial attack crews from BC Wildfire were called in to help.
An aerial assessment by helicopter determined bucketing was not necessary.
A fire inspector determined the blaze is suspicious and the investigation has been handed off to RCMP.
The fire came within about 300 metres of nearby homes.