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See Kaufman (1992) for detailed information on identification of bluebirds.
Montana Range
Observations in Montana: 3888
Montana CountiesBeaverhead, Big Horn, Blaine, Broadwater, Carbon, Carter, Cascade, Chouteau, Custer, Daniels, Dawson, Deer Lodge, Fallon, Fergus, Flathead, Gallatin, Garfield, Glacier, Golden Valley, Granite, Hill, Jefferson, Judith Basin, Lake, Lewis and Clark, Liberty, Lincoln, Madison, McCone, Meagher, Mineral, Missoula, Musselshell, Park, Petroleum, Phillips, Pondera, Powder River, Powell, Prairie, Ravalli, Richland, Roosevelt, Rosebud, Sanders, Sheridan, Silver Bow, Stillwater, Sweet Grass, Teton, Toole, Valley, Wheatland, Wibaux, Yellowstone
In the Bozeman area, normal migration periods are March 15 to April 25 and September 20 to October 15 (Skaar 1969).
Nesting records statewide are from April 5 to June 25 (Davis 1961). Near Fortine, egg dates for the first brood were April 28 to June 30 and for second brood, May 27 to June 23. Dates for nestlings are from May 14 to June 30.