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Montana Range
Observations in Montana: 132
Montana CountiesBeaverhead, Blaine, Broadwater, Carbon, Cascade, Chouteau, Custer, Dawson, Deer Lodge, Fergus, Flathead, Gallatin, Garfield, Golden Valley, Granite, Hill, Lewis and Clark, Liberty, Lincoln, Madison, McCone, Meagher, Missoula, Musselshell, Phillips, Powder River, Ravalli, Roosevelt, Rosebud, Sanders, Sheridan, Stillwater, Teton, Toole, Valley, Wheatland, Yellowstone
Most of Montana is west of the main spring migration. There is a more extensive migration in fall (Skaar, no date). In Bozeman migration occurs from August 20 to October 5, with a peak on September 20 (Skaar 1969).
Migrants are seen along prairie marshes or potholes. They are often found near grassy cover rather than on open mud flats (Johnsgard 1986).