Witnesses said they heard an explosion, possibly fireworks, at about 7:45 p.m. in an area where the canoes were stored between two houses. They investigated and found the fiberglass boats on fire, and flames spreading to a pair of 30-foot trees.
Embers from the burning trees started fires on three nearby houses. At least one of which appeared to have sustained moderate damage to its roof. Neighbors used hoses to put out many spot fires.
At one point, flames threatened a number of 5-gallon propane tanks stored on one of the properties. It was not immediately clear if they contained propane, but none of the tanks were damaged.
The fire came on the heels of a grass fire that destroyed at least one building and a line of fences behind houses on Sims Road near Brentwood Boulevard.
No injuries were reported in either incident, and the causes of both are under investigation, according to ECCFPD Chief Hugh Henderson.
Engines from East Contra Costa Fire Protection District and Confire units from as far away as Pittsburg took part in both incidents.