Thirza Frost was born c.1812 in St Marychurch, Torquay, Devon. Her parents are unknown.
Thirza married firstly William Spray on 3 April 1832. They had one known child, William Frost Spray. Thirza’s husband died in 1837.
A few years later, Thirza married Thomas Damerall. She had at least three children with Thomas: Sarah, John and Thereza.
Thirza died on 28 October 1897 at the age of 84. Her son John was present at the death, in St Marychurch, Devon.