Abstract
Between 1993 and 2001, 88 surveys were conducted at 31 historical sites of the northern leopard frog (Rana pipiens) in western Montana. Surveys were either a combination of visual encounter and dipnetting or were night-time audio surveys. No R. pipiens were found at any sites. A total of 1324 non-historical sites were surveyed at least once during the same time period, about half of which were considered suitable for R. pipiens. Rana pipiens was found at 2 locations whereas the Columbia spotted frog (Rana luteiventris) was found at 497 locations. The 2 R. pipiens sightings represent the only extant populations known to occur west of the Continental Divide in Montana.
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