_Winter range._--The Audubon warbler is found in winter =north= to southwestern British Columbia (Comox and Chilliwack). =East= to southwestern British Columbia (Chilliwack); central Washington (Yakima); occasionally eastern Washington (Cheney); northeastern Oregon, casually (Pendleton and Legrande); central California (Marysville and Fresno); casually to southwestern Utah (St. George and Zion National Park); central Arizona (Fort Mojave, Fort Verde, Salt River National Wildlife Refuge, and Tombstone); southern Texas (El Paso, rarely Knickerbocker, and Brownsville); Tamaulipas (Matamoros and Victoria); western Veracruz (Orizaba); and central Guatemala (San Jerónimo). =South= to Guatemala (San Jerónimo, Tecpán, and San Lucas); casual or accidental south to central Costa Rica (Juan Viñas). =West= to western Guatemala (San Lucas and Totonicapán); Oaxaca (Parada); Guerrero (Chilpancingo and Coyuca); western Jalisco (Tonila); Nayarit (Tepic); southern Sinaloa (Mazatlán); western Baja California (Santa Margarita and Natividad Islands); and the west coast of the United States to southwestern British Columbia (Comox). The preceding range is for the species as a whole of which two subspecies or geographic races are recognized. The Pacific Audubon's warbler (_D. a. auduboni_) breeds south to southern California, central Arizona, and New Mexico; the black-fronted Audubon's warbler (_D. a. nigrifrons_) breeds from the Huachuca Mountains, Ariz., through the mountains to southwestern Chihuahua. _Migration._--Late dates of spring departure from the winter range are: Guatemala--Tecpán, April 23. Sonora--Moctezuma, May 23. Texas--Marathon, May 18. Kansas--Fort Wallace, May 27. Arizona--Prescott, May 19. California--Fresno, May 3. Early dates of spring arrival are: Kansas--Garden City, April 22. Nebraska--Hastings, April 14. New Mexico--Apache, March 7. Colorado--Colorado Springs, April 12. Wyoming--Laramie, April 21. Montana--Fortine, April 14. Alberta--Banff, April 23. Utah--St. George, March 8. Nevada--Carson City, April 10. Idaho--Sandpoint, April 16. California--Grass Valley, April 10. Oregon--Prospect, March 6. Washington--Shelton, March 4. British Columbia--Summerland, March 30. Late dates of fall departure are: British Columbia--Okanagan Landing, October 24. Washington--Pullman, November 13. Oregon--Prospect, November 18. Idaho--Bayview, October 26. Utah--St. George, December 7. Alberta--Edmonton, September 11. Montana--Fortine, October 24. Wyoming--Laramie, November 9. Colorado--Fort Morgan, October 30. New Mexico--Silver City, November 10. Early dates of fall arrival are: California--San Diego, September 2. Texas--Fort Davis, September 9. Sonora--Las Cuevas, September 3. Guatemala--Chichicastenango, November 16.