The first courthouse was completed in 1853 as a three-storey wooden building at the intersection of Court and Church streets in the county seat of Weaverville.

[3] The 1853 Weaverville courthouse was condemned in an 1860 grand jury report, which found that "bed bugs had invaded the offices of the sheriff and the clerk, had defiled the records, and had even attacked a judge on the bench", prompting local officials to move.

[5] Trinity County purchased the building for US$9,000 (equivalent to $180,000 in 2023) in 1865, and it has since been remodeled and expanded in 1935, 1958, and 1976.

[6] In addition to the historic Weaverville courthouse, which was added to the National Register of Historic Places as part of the Weaverville Historic District in 1971,[5] Trinity County Superior Court also holds regularly scheduled sessions at the county sheriff's substation in Hayfork and at the Community Center dining hall in Mad River.

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