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Montana Field Guide

Montana Field Guides

Bog Fritillary - Boloria eunomia

Native Species

Global Rank: G5
State Rank: SU

Agency Status


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General Description
[From Ferris and Brown 1981, Scott 1986, Glassberg 2001, Guppy and Shepard 2001] Forewing 1.8-2.0 cm. Variable in ground color; dorsal surface pale yellowish-brown to rich orangish-brown with dark scaling at wing base; dorsal hindwing with black border and inward-pointing chevrons enclosing pale spots; ventral hindwing with row of large marginal spots silver to clear-yellowish, an even row of white-centered postmedian spots outlined in black, and a white median cell spot at inner margin which is outwardly convex.

One flight: July to early August in the south at higher elevations, mid-June to July in north, mid-July to August in Labrador and central Wyoming (Ferris and Brown 1981, Scott 1986); in British Columbia, mid-June to early August (Guppy and Shepard 2001).

Diagnostic Characteristics
Identified by the ventral hindwing with row of large marginal spots silver to clear-yellowish, an even row of white-centered postmedian spots outlined in black, and a white median cell spot at inner margin which is outwardly convex.

Species Range
Montana Range Range Descriptions


Range Comments
Alaska and most of boreal and arctic Canada south to the bordering United States including northern Maine and the northern Great Lakes region; south in the Rocky Mountains of Montana, Wyoming, and Colorado in disjunct populations (Scott 1986, Guppy and Shepard 2001). In Montana, reported from the Beartooth Mountains in Carbon and Stillwater counties, and Glacier National Park in Glacier County (Kohler 1980, Stanford and Opler 1993). Locally rare to locally uncommon (Glassberg 2001).

Observations in Montana Natural Heritage Program Database
Number of Observations: 3

(Click on the following maps and charts to see full sized version) Map Help and Descriptions
Relative Density



(Observations spanning multiple months or years are excluded from time charts)

Non-migratory; often move a few hundred meters through woods between wet habitat areas (Scott 1986).

Spruce forest meadows along streams, sphagnum fens and bog edges, margins of glacial tarns, moist tundra above treeline (Ferris and Brown 1981, Scott 1986, Guppy and Shepard 2001).

Ecological Systems Associated with this Species
  • Details on Creation and Suggested Uses and Limitations
    How Associations Were Made
    We associated the use and habitat quality (common or occasional) of each of the 82 ecological systems mapped in Montana for vertebrate animal species that regularly breed, overwinter, or migrate through the state by:
    1. Using personal observations and reviewing literature that summarize the breeding, overwintering, or migratory habitat requirements of each species (Dobkin 1992, Hart et al. 1998, Hutto and Young 1999, Maxell 2000, Foresman 2012, Adams 2003, and Werner et al. 2004);
    2. Evaluating structural characteristics and distribution of each ecological system relative to the species' range and habitat requirements;
    3. Examining the observation records for each species in the state-wide point observation database associated with each ecological system;
    4. Calculating the percentage of observations associated with each ecological system relative to the percent of Montana covered by each ecological system to get a measure of "observations versus availability of habitat".
    Species that breed in Montana were only evaluated for breeding habitat use, species that only overwinter in Montana were only evaluated for overwintering habitat use, and species that only migrate through Montana were only evaluated for migratory habitat use.  In general, species were listed as associated with an ecological system if structural characteristics of used habitat documented in the literature were present in the ecological system or large numbers of point observations were associated with the ecological system.  However, species were not listed as associated with an ecological system if there was no support in the literature for use of structural characteristics in an ecological system, even if point observations were associated with that system.  Common versus occasional association with an ecological system was assigned based on the degree to which the structural characteristics of an ecological system matched the preferred structural habitat characteristics for each species as represented in scientific literature.  The percentage of observations associated with each ecological system relative to the percent of Montana covered by each ecological system was also used to guide assignment of common versus occasional association.  If you have any questions or comments on species associations with ecological systems, please contact the Montana Natural Heritage Program's Senior Zoologist.

    Suggested Uses and Limitations
    Species associations with ecological systems should be used to generate potential lists of species that may occupy broader landscapes for the purposes of landscape-level planning.  These potential lists of species should not be used in place of documented occurrences of species (this information can be requested at: or systematic surveys for species and evaluations of habitat at a local site level by trained biologists.  Users of this information should be aware that the land cover data used to generate species associations is based on imagery from the late 1990s and early 2000s and was only intended to be used at broader landscape scales.  Land cover mapping accuracy is particularly problematic when the systems occur as small patches or where the land cover types have been altered over the past decade.  Thus, particular caution should be used when using the associations in assessments of smaller areas (e.g., evaluations of public land survey sections).  Finally, although a species may be associated with a particular ecological system within its known geographic range, portions of that ecological system may occur outside of the species' known geographic range.

    Literature Cited
    • Adams, R.A.  2003.  Bats of the Rocky Mountain West; natural history, ecology, and conservation.  Boulder, CO: University Press of Colorado.  289 p.
    • Dobkin, D. S.  1992.  Neotropical migrant land birds in the Northern Rockies and Great Plains. USDA Forest Service, Northern Region. Publication No. R1-93-34.  Missoula, MT.
    • Foresman, K.R.  2012.  Mammals of Montana.  Second edition.  Mountain Press Publishing, Missoula, Montana.  429 pp.
    • Hart, M.M., W.A. Williams, P.C. Thornton, K.P. McLaughlin, C.M. Tobalske, B.A. Maxell, D.P. Hendricks, C.R. Peterson, and R.L. Redmond. 1998.  Montana atlas of terrestrial vertebrates.  Montana Cooperative Wildlife Research Unit, University of Montana, Missoula, MT.  1302 p.
    • Hutto, R.L. and J.S. Young.  1999.  Habitat relationships of landbirds in the Northern Region, USDA Forest Service, Rocky Mountain Research Station RMRS-GTR-32.  72 p.
    • Maxell, B.A.  2000.  Management of Montana's amphibians: a review of factors that may present a risk to population viability and accounts on the identification, distribution, taxonomy, habitat use, natural history, and the status and conservation of individual species.  Report to U.S. Forest Service Region 1.  Missoula, MT: Wildlife Biology Program, University of Montana.  161 p.
    • Werner, J.K., B.A. Maxell, P. Hendricks, and D. Flath.  2004.  Amphibians and reptiles of Montana.  Missoula, MT: Mountain Press Publishing Company. 262 p.

Food Habits
Larval food plants include Bistorta, Polygonum, Salix, and Viola, with Salix and Viola readily eaten in captivity (Ferris and Brown 1981, Scott 1986). Adults feed on flower nectar.

Reproductive Characteristics
Little information. Eggs laid in clusters of 2-4 (rarely 20) under leaves of host plants; larvae overwinter as L3-L4 instars. Males patrol throughout the day low over bogs in search of females (Scott 1986).

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Citation for data on this website:
Bog Fritillary — Boloria eunomia.  Montana Field Guide.  .  Retrieved on , from