Range.—Southwestern United States to central Mexico.
Breeding range.—Grace’s warbler breeds north to southern Utah (Zion National Park); southwestern Colorado (Fort Lewis and Pagosa Springs); and central northern New Mexico (Tres Piedras; possibly Sierra Grande). East to central New Mexico (Tres Piedras and Mesa Yegua); western Texas (Guadalupe Mountains); and northwestern Chihuahua (Colonia García). South to northwestern Chihuahua (Colonia García) and southeastern Sonora (Rancho Santa Bárbara). West to western Sonora (Rancho Santa Bárbara, Moctezuma, and Nogales); eastern central and western Arizona (Huachuca Mountains, Tucson, Fort Whipple, Hualpai Mountains, and Mount Trumble); and southwestern Utah (Zion National Park).
Winter range.—In winter Grace’s warbler seems to be confined to a small area in central western Mexico, from central Jalisco (Bolaños) southeast to east central Michoacán (Patambán and Patzcuaro); and west to south central Jalisco (Zapotitlán); occasional north to northern Nayarit (Santa Teresa).
Migration.—Very little information is available regarding the migratory movements of Grace’s warbler. Dates of spring arrival are: Sonora—Mina Abundancia, April 11. New Mexico—Silver City, April 20. Arizona—Santa Rita Mountains, March 15. The latest date of one recorded at Albuquerque, New Mexico, is September 7. A resident race occurs in Central America.
Egg dates.—Arizona: 9 records, May 3 to June 27; 5 records, May 30 to June 8, indicating the height of the season.
New Mexico: 2 records, May 22 and June 13 (Harris).
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