The broad-billed hummingbird typically creates a nest within 2 meters of the ground. In Guadalupe Canyon, most nests were found to be at an average height of 1.1 meter above the ground. Although the height from the ground matters to the mothers, the nesting habitats have been found at many elevations. One study found 4 nests between 14 meters, in Sinaloa, to 442 meters, in Sonora. Nest site selection is thought to be less specific in individuals living towards the southern part of the range. The nests themselves are constructed only by the females. The female will weave nesting material (bark, grasses and dried leaves) into a nest and shape it with her body. The nest is about 2.5 cm tall, with an interior diameter of 1.9 cm. The interior is lined with materials such as white plant down, plant stems, leaves, plant blooms and even lichen. Once ready, the female broad-billed hummingbird will lay 2 eggs into her nest. The eggs of "C. latirostris" are smooth and white. On average, the eggs measure 12 by 8 millimeters. Although uncertain, it's believed that the female incubates the eggs for more than 2 weeks. After hatching, in Guadalupe Canyon the females spent about 60% of each hour at her nest. The largest causes of nest mortality are due to predation on eggs and nestlings, abandonment of nest before egg and failure for eggs to hatch.