Wildflowers Blooming in Colorado in October (60 Species)

60 wildflowers were recorded blooming in Colorado in October in our iNaturalist sample; 8 of the top 50 are at their peak this month. The list is ranked by number of research-grade observations.

Mar Apr May Jun Jul Aug Sep Oct

Top wildflowers in October

Rubber Rabbitbrush114 obs.

Great Mullein57 obs.

Rocky Mountain Beeplant54 obs.

Field Bindweed40 obs.

Alfalfa24 obs.

White Sweetclover21 obs.

Redstem Stork's-bill18 obs.

Western Harebell18 obs.

Common Toadflax17 obs.

Common Yarrow17 obs.

Creeping Thistle16 obs.

Scarlet Gilia15 obs.

All wildflowers blooming in Colorado in October

#	Species	Scientific name	Family	Obs.	Peak in state
1	Rubber Rabbitbrush	Ericameria nauseosa	Sunflowers, Daisies, Asters, and Allies	114	Sep (past peak)
2	Great Mullein	Verbascum thapsus	figwort family	57	Jul (past peak)
3	Rocky Mountain Beeplant	Cleomella serrulata	Spider Flower Family	54	Aug (past peak)
4	Field Bindweed	Convolvulus arvensis	bindweed family	40	Jun (past peak)
5	Alfalfa	Medicago sativa	Legumes	24	Jun (past peak)
6	White Sweetclover	Melilotus albus	Legumes	21	Oct (peak)
7	Redstem Stork's-bill	Erodium cicutarium	Geranium family	18	May (past peak)
8	Western Harebell	Campanula petiolata	bellflower family	18	Jul (past peak)
9	Common Toadflax	Linaria vulgaris	Plantain Family	17	Aug (past peak)
10	Common Yarrow	Achillea millefolium	Sunflowers, Daisies, Asters, and Allies	17	Jul (past peak)
11	Creeping Thistle	Cirsium arvense	Sunflowers, Daisies, Asters, and Allies	16	Jul (past peak)
12	Scarlet Gilia	Ipomopsis aggregata	phlox family	15	Jul (past peak)
13	Chicory	Cichorium intybus	Sunflowers, Daisies, Asters, and Allies	15	Aug (past peak)
14	Dwarf Mallow	Malva neglecta	Mallow and Hibiscus Family	15	Sep (past peak)
15	Plains Coreopsis	Coreopsis tinctoria	Sunflowers, Daisies, Asters, and Allies	13	Oct (peak)
16	Yellow Sweetclover	Melilotus officinalis	Legumes	12	Jun (past peak)
17	Puncture Vine	Tribulus terrestris	caltrops	11	Aug (past peak)
18	Cowpen Daisy	Verbesina encelioides	Sunflowers, Daisies, Asters, and Allies	11	Sep (past peak)
19	Musk Thistle	Carduus nutans	Sunflowers, Daisies, Asters, and Allies	10	Jul (past peak)
20	Red Clover	Trifolium pratense	Legumes	9	Jul (past peak)
21	Upright Prairie Coneflower	Ratibida columnifera	Sunflowers, Daisies, Asters, and Allies	8	Jul (past peak)
22	Purple Groundcherry	Quincula lobata	nightshade family	7	May (past peak)
23	Virginia strawberry	Fragaria virginiana	rose family	7	Jun (past peak)
24	Western Wallflower	Erysimum capitatum	mustard family	6	Jun (past peak)
25	Wild Teasel	Dipsacus fullonum	honeysuckle family	6	Oct (peak)
26	Common Sunflower	Helianthus annuus	Sunflowers, Daisies, Asters, and Allies	6	Aug (past peak)
27	Hoary Alyssum	Berteroa incana	mustard family	6	Aug (past peak)
28	Pearly Everlasting	Anaphalis margaritacea	Sunflowers, Daisies, Asters, and Allies	5	Aug (past peak)
29	White Clover	Trifolium repens	Legumes	5	Sep (past peak)
30	Buffalo-Bur	Solanum rostratum	nightshade family	5	Aug (past peak)
31	Curlycup Gumweed	Grindelia squarrosa	Sunflowers, Daisies, Asters, and Allies	5	Sep (past peak)
32	Scarlet Globemallow	Sphaeralcea coccinea	Mallow and Hibiscus Family	5	Jun (past peak)
33	Winecup Mallow	Callirhoe involucrata	Mallow and Hibiscus Family	5	Jul (past peak)
34	Fireweed	Chamaenerion angustifolium	evening primrose family	5	Jul (past peak)
35	Prickly Cucumber	Echinocystis lobata	gourd family	4	Oct (peak)
36	Ribwort Plantain	Plantago lanceolata	Plantain Family	4	Oct (peak)
37	Deptford pink	Dianthus armeria	pink family	4	Oct (peak)
38	Spotted Knapweed	Centaurea stoebe	Sunflowers, Daisies, Asters, and Allies	4	Sep (past peak)
39	Sulfur Buckwheat	Eriogonum umbellatum	knotweed family	4	Jun (past peak)
40	Creeping Bellflower	Campanula rapunculoides	bellflower family	4	Sep (past peak)
41	Prairie Pasqueflower	Pulsatilla nuttalliana	buttercup family	4	May (past peak)
42	Common Dandelion	Taraxacum officinale	Sunflowers, Daisies, Asters, and Allies	3	Apr (past peak)
43	Common Morning-Glory	Ipomoea purpurea	bindweed family	3	Sep (past peak)
44	Henbit Deadnettle	Lamium amplexicaule	Mint Family	3	Apr (past peak)
45	Bittersweet Nightshade	Solanum dulcamara	nightshade family	3	Oct (peak)
46	Common Soapwort	Saponaria officinalis	pink family	3	Sep (past peak)
47	Broad-Leaved Sweet Pea	Lathyrus latifolius	Legumes	3	Aug (past peak)
48	Shrubby Cinquefoil	Dasiphora fruticosa	rose family	3	Jul (past peak)
49	Cornflower	Centaurea cyanus	Sunflowers, Daisies, Asters, and Allies	3	Oct (peak)
50	Common Groundsel	Senecio vulgaris	Sunflowers, Daisies, Asters, and Allies	2	Apr (past peak)