Incubation requires 13 to 16 days. Eggs hatch sometime between June 12 and June 26. Some pairs raise two broods a season. The average production per pair is three or more young each year. Fledging - Young develop rapidly and are out of the nest within 9 days.
Most nests are sunken so as to be flush with the ground surface.
Nests are usually located in areas where they are shaded by small jack pines and well concealed by lush ground cover. Nests are often found near or at the edge of a fairly dense growth of jack pines. The crucial requirement for suitable nesting habitat appears to be the presence of living pine-branch thickets near the ground. The Kirtland's warbler spends 44 percent of the year on its wintering grounds in the Bahamas. The Kirtland's warbler requires dense ground vegetation for nesting cover.