Quick answer: 39 native Montana plants have a recorded bloom range that includes August.
39 species
- Big bluestem Andropogon gerardii · 41 states
- Big sagebrush Artemisia tridentata · 14 states
- Black-eyed Susan Rudbeckia hirta · 44 states
- Blue grama Bouteloua gracilis · 19 states
- Buffalograss Bouteloua dactyloides · 19 states
- Colorado blue columbine Aquilegia coerulea · 9 states
- Common gaillardia (blanketflower) Gaillardia aristata · 11 states
- Common sneezeweed Helenium autumnale · 40 states
- Common sunflower Helianthus annuus · 18 states
- Common yarrow Achillea millefolium · 47 states
- Cutleaf coneflower Rudbeckia laciniata · 43 states
- Dotted blazing star Liatris punctata · 17 states
- Fireweed Chamerion angustifolium · 37 states
- Giant red paintbrush Castilleja miniata · 13 states
- Harebell Campanula rotundifolia · 35 states
- Hooker's evening primrose Oenothera elata · 14 states
- Indiangrass Sorghastrum nutans · 37 states
- Lewis flax (blue flax) Linum lewisii · 17 states
- Little bluestem Schizachyrium scoparium · 42 states
- Littleflower penstemon Penstemon procerus · 11 states
- Mexican hat Ratibida columnifera · 17 states
- Munro's globemallow Sphaeralcea munroana · 9 states
- Nettleleaf giant hyssop Agastache urticifolia · 9 states
- Pearly everlasting Anaphalis margaritacea · 38 states
- Purple prairie clover Dalea purpurea · 18 states
- Rocky Mountain bee plant Peritoma serrulata · 26 states
- Rubber rabbitbrush Ericameria nauseosa · 17 states
- Scarlet gilia Ipomopsis aggregata · 13 states
- Scarlet globemallow Sphaeralcea coccinea · 12 states
- Seep monkeyflower Erythranthe guttata · 15 states
- Showy milkweed Asclepias speciosa · 17 states
- Shrubby cinquefoil Dasiphora fruticosa ssp. floribunda · 23 states
- Sideoats grama Bouteloua curtipendula · 38 states
- Smooth sumac Rhus glabra · 42 states
- Sulphur-flower buckwheat Eriogonum umbellatum · 10 states
- Swamp milkweed Asclepias incarnata · 37 states
- Switchgrass Panicum virgatum · 43 states
- Tufted evening primrose Oenothera caespitosa · 15 states
- Western yarrow Achillea millefolium var. occidentalis · 18 states
August in a Montana native garden
August is a quieter month in Montana: 39 of the state's 78 native plants flower in August, compared with 56 at the June peak. That makes these plants valuable for keeping color, and food for pollinators, going outside the main season.
7 start blooming in August, including Big bluestem, Big sagebrush and Dotted blazing star. 7 finish in August, including Colorado blue columbine, Lewis flax (blue flax) and Littleflower penstemon, so this is the last chance to see them in flower.
37 of them grow in full or partial sun and 6 tolerate shade, so there are options for open beds and woodland edges alike. Sizes run from low plants like Black-eyed Susan and Buffalograss to trees such as Smooth sumac. For wildlife, 35 support pollinators, 23 provide food or cover for birds and 13 are caterpillar host plants.
28 of the 39 have a seed or plant listing we verified as the wild species. Be careful buying Black-eyed Susan, Common yarrow, Harebell: common listings for these are often a bred variety or a different species.
Good places to start
Verified wild-species listings that take sun and are widely native, so they are forgiving first plants.
- Cutleaf coneflower Rudbeckia laciniata · Sun, Part Shade, Shade · blooms Jul-Oct
- Little bluestem Schizachyrium scoparium · Sun, Part Shade · blooms Jun-Dec
- Smooth sumac Rhus glabra · Sun, Part Shade, Shade · blooms May-Aug