Frog Rock, Glacial erratic on Bainbridge Island, Washington, US.

Frog Rock is a glacial erratic on Bainbridge Island, Washington, made of two stacked granite boulders painted to resemble a frog. The boulders were reportedly once a single rock that was dynamited in the 1950s or earlier to clear it from a road right-of-way; the split pieces were later stacked and painted on June 6, 1971.

The boulder was reportedly dynamited in the 1950s or earlier to clear it from a road right-of-way, after which it was known as Split Rock. On June 6, 1971, a pair of local residents painted the two stacked granite boulders to resemble a frog. In September 2026 Frog Rock was approved for the Washington State Heritage Register.

Frog Rock is a local landmark on Bainbridge Island, painted on June 6, 1971 by two residents who stacked two granite boulders to look like a frog. Cyclists use it as a regrouping point, and a local resiliency forum takes its name from the rock.

The rock sits at a busy street corner and is easily reached on foot or by bicycle. Visit during daylight hours for the best view of the painted details and to take clear photographs of the design.

Frog Rock was approved for the Washington State Heritage Register in September 2026. A local "resiliency forum" also takes its name from the painted boulders, which began as a single granite block split by dynamite for a road right-of-way.