Wildflowers Blooming in Colorado in May (47 Species)

47 wildflowers were recorded blooming in Colorado in May in our iNaturalist sample; 21 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 May

Prairie Pasqueflower530 obs.

American plum419 obs.

Purple Groundcherry401 obs.

Common Starlily393 obs.

Bearberry278 obs.

Creeping Mahonia146 obs.

Field Bindweed144 obs.

Saskatoon141 obs.

Common Lilac111 obs.

Scarlet Globemallow105 obs.

Redstem Stork's-bill97 obs.

Chokecherry86 obs.

All wildflowers blooming in Colorado in May

#	Species	Scientific name	Family	Obs.	Peak in state
1	Prairie Pasqueflower	Pulsatilla nuttalliana	buttercup family	530	May (peak)
2	American plum	Prunus americana	rose family	419	Apr (past peak)
3	Purple Groundcherry	Quincula lobata	nightshade family	401	May (peak)
4	Common Starlily	Leucocrinum montanum	agave and allies	393	May (peak)
5	Bearberry	Arctostaphylos uva-ursi	heath family	278	May (peak)
6	Creeping Mahonia	Berberis repens	barberry family	146	May (peak)
7	Field Bindweed	Convolvulus arvensis	bindweed family	144	Jun (rising)
8	Saskatoon	Amelanchier alnifolia	rose family	141	Jun (rising)
9	Common Lilac	Syringa vulgaris	olive family	111	May (peak)
10	Scarlet Globemallow	Sphaeralcea coccinea	Mallow and Hibiscus Family	105	Jun (rising)
11	Redstem Stork's-bill	Erodium cicutarium	Geranium family	97	May (peak)
12	Chokecherry	Prunus virginiana	rose family	86	May (peak)
13	Glacier Lily	Erythronium grandiflorum	lily family	84	Jun (rising)
14	Upland Larkspur	Delphinium nuttallianum	buttercup family	84	Jun (rising)
15	Narrowleaf Puccoon	Lithospermum incisum	borage family	74	May (peak)
16	Sego Lily	Calochortus nuttallii	lily family	73	Jun (rising)
17	Western Wallflower	Erysimum capitatum	mustard family	63	Jun (rising)
18	Yellow Salsify	Tragopogon dubius	Sunflowers, Daisies, Asters, and Allies	62	Jun (rising)
19	Golden Currant	Ribes aureum	Gooseberry Family	49	Apr (past peak)
20	Dame's Rocket	Hesperis matronalis	mustard family	48	May (peak)
21	Sulfur Buckwheat	Eriogonum umbellatum	knotweed family	45	Jun (rising)
22	Bastard Toadflax	Comandra umbellata	sandalwood family	43	May (peak)
23	Virginia strawberry	Fragaria virginiana	rose family	43	Jun (rising)
24	Prairie Smoke	Geum triflorum	rose family	37	Jun (rising)
25	Annual Honesty	Lunaria annua	mustard family	36	May (peak)
26	Canada Violet	Viola canadensis	Violet Family	34	Jun (rising)
27	Field Penny-Cress	Thlaspi arvense	mustard family	34	May (peak)
28	Star-Flowered Lily-Of-The-Valley	Maianthemum stellatum	agave and allies	33	Jun (rising)
29	Blue Columbine	Aquilegia coerulea	buttercup family	32	Jul (rising)
30	Lewis flax	Linum lewisii	Flax Family	31	Jul (rising)
31	Fendler's Sandmat	Euphorbia fendleri	Spurge Family	28	Jun (rising)
32	Common Dandelion	Taraxacum officinale	Sunflowers, Daisies, Asters, and Allies	25	Apr (past peak)
33	Scarlet Gilia	Ipomopsis aggregata	phlox family	24	Jul (rising)
34	Blackfoot Daisy	Melampodium leucanthum	Sunflowers, Daisies, Asters, and Allies	21	May (peak)
35	Yellow Sweetclover	Melilotus officinalis	Legumes	20	Jun (rising)
36	Garlic Mustard	Alliaria petiolata	mustard family	19	May (peak)
37	Black Medick	Medicago lupulina	Legumes	19	May (peak)
38	Rocky Mountain Beeplant	Cleomella serrulata	Spider Flower Family	19	Aug (rising)
39	Arrowleaf Balsamroot	Balsamorhiza sagittata	Sunflowers, Daisies, Asters, and Allies	18	May (peak)
40	Antelope Bitterbrush	Purshia tridentata	rose family	17	Jun (rising)
41	Dwarf Mallow	Malva neglecta	Mallow and Hibiscus Family	16	Sep (rising)
42	Notch-leaf Scorpionweed	Phacelia crenulata	borage family	14	May (peak)
43	Lesser Periwinkle	Vinca minor	Dogbane Family	14	May (peak)
44	Woodland Strawberry	Fragaria vesca	rose family	13	May (peak)
45	Catchweed Bedstraw	Galium aparine	madder family	13	May (peak)
46	Edible Valerian	Valeriana edulis	honeysuckle family	13	Jul (rising)
47	Sagebrush Buttercup	Ranunculus glaberrimus	buttercup family	12	Apr (past peak)