Loch Lomond Vernal Pool Ecological Reserve, Protected area in Lake County, California.

The Loch Lomond Vernal Pool Ecological Reserve is an 8.22-acre protected area in the community of Loch Lomond, Lake County, California, within the Mayacamas Mountains of the California Coast Ranges. It centers on a vernal pool, a seasonal wetland that supports the endangered Loch Lomond button celery (Eryngium constancei). A post-and-rail fence installed by the California Department of Fish and Game limits access.

The California Department of Fish and Game bought the 8.22-acre parcel on March 28, 1988, for $46,000, using funds from the State Public Works Board and the California Wildlife Conservation Board. The purchase followed the 1985 emergency federal listing of the Loch Lomond button celery, whose only known population grew in the pool. Before that, the meadow hosted baseball, horseback riding, ice-skating, volleyball and cycling beside the Loch Lomond Lodge, a resort destroyed by fire on August 14, 1967.

Before the reserve was created, the meadow served as a recreation field for baseball, horseback riding, ice-skating, volleyball and cycling. It stood beside the Loch Lomond Lodge, a resort popular with locals until a fire destroyed it on August 14, 1967.

Access is limited by a post-and-rail fence installed by the Department of Fish and Game, so the meadow is not open for wandering. Off-road vehicles remain a problem in the rainy season, and the Department was surveying the property for new fencing in 2009. The reserve lies in the Loch Lomond community of Lake County, in the Mayacamas Mountains south of Cobb Mountain.

The reserve protects a rare plant species called Loch Lomond button celery, which was first collected in 1941 and later studied in depth. This specialized flora makes the location scientifically important for botanical research.