Wildflowers Blooming in Montana in September (60 Species)

60 wildflowers were recorded blooming in Montana in September in our iNaturalist sample; 9 of the top 50 are at their peak this month. The list is ranked by number of research-grade observations.

Apr May Jun Jul Aug Sep Oct

Top wildflowers in September

Rocky Mountain Beeplant42 obs.

Fireweed40 obs.

Pearly Everlasting23 obs.

Fringed Grass of Parnassus23 obs.

Spotted Knapweed16 obs.

Curlycup Gumweed15 obs.

Common Tansy13 obs.

Common Yarrow12 obs.

Lewis' monkeyflower11 obs.

Rubber Rabbitbrush9 obs.

Common Toadflax8 obs.

Great Mullein8 obs.

All wildflowers blooming in Montana in September

#	Species	Scientific name	Family	Obs.	Peak in state
1	Rocky Mountain Beeplant	Cleomella serrulata	Spider Flower Family	42	Aug (past peak)
2	Fireweed	Chamaenerion angustifolium	evening primrose family	40	Jul (past peak)
3	Pearly Everlasting	Anaphalis margaritacea	Sunflowers, Daisies, Asters, and Allies	23	Jul (past peak)
4	Fringed Grass of Parnassus	Parnassia fimbriata	staff-vine family	23	Aug (past peak)
5	Spotted Knapweed	Centaurea stoebe	Sunflowers, Daisies, Asters, and Allies	16	Jul (past peak)
6	Curlycup Gumweed	Grindelia squarrosa	Sunflowers, Daisies, Asters, and Allies	15	Aug (past peak)
7	Common Tansy	Tanacetum vulgare	Sunflowers, Daisies, Asters, and Allies	13	Aug (past peak)
8	Common Yarrow	Achillea millefolium	Sunflowers, Daisies, Asters, and Allies	12	Jul (past peak)
9	Lewis' monkeyflower	Erythranthe lewisii	lopseed family	11	Aug (past peak)
10	Rubber Rabbitbrush	Ericameria nauseosa	Sunflowers, Daisies, Asters, and Allies	9	Sep (peak)
11	Common Toadflax	Linaria vulgaris	Plantain Family	8	Jul (past peak)
12	Great Mullein	Verbascum thapsus	figwort family	8	Jul (past peak)
13	Western Harebell	Campanula petiolata	bellflower family	8	Jul (past peak)
14	Threeleaf Foamflower	Tiarella trifoliata	saxifrage family	7	Jul (past peak)
15	Oxeye Daisy	Leucanthemum vulgare	Sunflowers, Daisies, Asters, and Allies	7	Jul (past peak)
16	Hoary Alyssum	Berteroa incana	mustard family	7	Jul (past peak)
17	Shrubby Cinquefoil	Dasiphora fruticosa	rose family	7	Jun (past peak)
18	Virginia strawberry	Fragaria virginiana	rose family	7	Jun (past peak)
19	Red Clover	Trifolium pratense	Legumes	6	Jun (past peak)
20	Mountain Bog Gentian	Gentiana calycosa	gentian family	6	Aug (past peak)
21	Yellow Sweetclover	Melilotus officinalis	Legumes	6	Jun (past peak)
22	Creeping Thistle	Cirsium arvense	Sunflowers, Daisies, Asters, and Allies	6	Aug (past peak)
23	Alfalfa	Medicago sativa	Legumes	5	Sep (peak)
24	Redstem Stork's-bill	Erodium cicutarium	Geranium family	4	May (past peak)
25	Common Snowberry	Symphoricarpos albus	honeysuckle family	4	Jul (past peak)
26	Common Selfheal	Prunella vulgaris	Mint Family	4	Jul (past peak)
27	Field Bindweed	Convolvulus arvensis	bindweed family	4	Jun (past peak)
28	Yellow Salsify	Tragopogon dubius	Sunflowers, Daisies, Asters, and Allies	4	Jun (past peak)
29	Musk Thistle	Carduus nutans	Sunflowers, Daisies, Asters, and Allies	4	Jun (past peak)
30	Creeping Bellflower	Campanula rapunculoides	bellflower family	4	Aug (past peak)
31	Herb Robert	Geranium robertianum	Geranium family	3	Sep (peak)
32	Common Sunflower	Helianthus annuus	Sunflowers, Daisies, Asters, and Allies	3	Sep (peak)
33	White Sweetclover	Melilotus albus	Legumes	3	Jul (past peak)
34	Moth Mullein	Verbascum blattaria	figwort family	3	Sep (peak)
35	White Campion	Silene latifolia	pink family	3	Jun (past peak)
36	Prairie Pasqueflower	Pulsatilla nuttalliana	buttercup family	3	Apr (past peak)
37	Chicory	Cichorium intybus	Sunflowers, Daisies, Asters, and Allies	2	Aug (past peak)
38	Ribwort Plantain	Plantago lanceolata	Plantain Family	2	Sep (peak)
39	Common St. John's Wort	Hypericum perforatum	St. John's wort family	2	Jul (past peak)
40	Blue Vervain	Verbena hastata	Verbena Family	2	Sep (peak)
41	Lewis flax	Linum lewisii	Flax Family	2	Jul (past peak)
42	Puncture Vine	Tribulus terrestris	caltrops	2	Sep (peak)
43	Northern Bedstraw	Galium boreale	madder family	2	Jul (past peak)
44	Richardson's geranium	Geranium richardsonii	Geranium family	2	Jun (past peak)
45	Tall Goldenrod	Solidago altissima	Sunflowers, Daisies, Asters, and Allies	2	Sep (peak)
46	Bird's-Foot Trefoil	Lotus corniculatus	Legumes	1	Jun (past peak)
47	Ghost Pipe	Monotropa uniflora	heath family	1	Aug (past peak)
48	Red Osier Dogwood	Cornus sericea	Dogwood family	1	Jun (past peak)
49	Bittersweet Nightshade	Solanum dulcamara	nightshade family	1	Aug (past peak)
50	White Clover	Trifolium repens	Legumes	1	Jun (past peak)