Dock Spider
The large brown spider on the boathouse wall. Dock spiders are semi-aquatic, common across Ontario waterfront properties, and intimidating to look at — but not aggressive toward humans.
Body up to 25 mm, leg span up to 75 mm. One of the largest spiders in Ontario. Brown with pale stripes along the abdomen. Long legs held flat against surfaces. Often found in groups on dock pilings, boathouse walls, and seawalls.
Docks, boathouses, seawalls, cottage decks, and any structure within a few metres of fresh water. Active May through September. Can run across the water surface and dive briefly underwater.
No. Dock spiders can bite if cornered and the bite is painful but not medically significant. They avoid humans and will retreat into water if approached. The size is the main concern, not actual risk.
Waterfront perimeter treatments target dock spiders specifically. Treat dock pilings, boathouse exteriors, and seawalls early in the season for best results. See waterfront and cottage service →
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