The curve-billed breeding season begins in February and reaches an apex between March and May; however, new fledglings have been recorded as late as August.
Dates vary within its range due to temperature and rainfall.
Nests are generally built at conspicuous locations, the cholla being favored.
Other potential nesting sites range from mesquite, prickly pear or yucca to the occasional oak and pine trees.
The nest is generally a deep cup but can be flat with a depression for the eggs.
The outer layer consists of thorny twigs while the inner layer includes smooth sticks, roots, coarse and fine grasses, rootlets or hair.

Both sexes build the nest; the building periods can be as brief as three days to as long as four weeks.
Egg count differs by location; the number has been as low as two and as high as five.
Egg color varies; they can appear bluish green to pale yellowish blue, spotted abundantly in reddish brown.
Both sexes incubate but the female is mainly responsible as well as being the sole provider of brooding.
Curve-billed parents defend their nests fervently against other species; snakes are the most frequent predators of eggs and nestlings.
Curved-billed Thrashers are rarely victims of nest parasitism by cowbirds.
In situations where food is scarce, parents feed older fledglings first.
The fledging period ranges from 11 to 18 days.
The curve-billed breeding season begins in February and reaches an apex between March and May; however, new fledglings have been recorded as late as August. Dates vary within its range due to temperature and rainfall. Nests are generally built at conspicuous locations, the cholla being favored. Other potential nesting sites range from mesquite, prickly pear or yucca to the occasional oak and pine trees. The nest is generally a deep cup but can be flat with a depression for the eggs. The outer layer consists of thorny twigs while the inner layer includes smooth sticks, roots, coarse and fine grasses, rootlets or hair.
Both sexes build the nest; the building periods can be as brief as three days to as long as four weeks. Egg count differs by location; the number has been as low as two and as high as five. Egg color varies; they can appear bluish green to pale yellowish blue, spotted abundantly in reddish brown. Both sexes incubate but the female is mainly responsible as well as being the sole provider of brooding. Curve-billed parents defend their nests fervently against other species; snakes are the most frequent predators of eggs and nestlings. Curved-billed Thrashers are rarely victims of nest parasitism by cowbirds. In situations where food is scarce, parents feed older fledglings first. The fledging period ranges from 11 to 18 days.
Curve-billed thrasher