60 wildflowers were recorded blooming in Idaho in May in our iNaturalist sample; 24 of the top 50 are at their peak this month. The list is ranked by number of research-grade observations.
Top wildflowers in May
Small Camas
Large-Flowered Triteleia
Yellow Fritillary
Pacific trillium
Spotted Fritillary
Glacier Lily
Arrowleaf Balsamroot
Longhorn Steer's-Head
Hooker's onion
Saskatoon
Bearberry
Checker Lily
All wildflowers blooming in Idaho in May
| # | Species | Scientific name | Family | Obs. | Peak in state |
|---|---|---|---|---|---|
| 1 | Small Camas | Camassia quamash | agave and allies | 171 | May (peak) |
| 2 | Large-Flowered Triteleia | Triteleia grandiflora | agave and allies | 169 | May (peak) |
| 3 | Yellow Fritillary | Fritillaria pudica | lily family | 113 | Apr (past peak) |
| 4 | Pacific trillium | Trillium ovatum | Herb-Paris, False Hellebores, Trilliums and allies | 110 | May (peak) |
| 5 | Spotted Fritillary | Fritillaria atropurpurea | lily family | 93 | May (peak) |
| 6 | Glacier Lily | Erythronium grandiflorum | lily family | 79 | May (peak) |
| 7 | Arrowleaf Balsamroot | Balsamorhiza sagittata | Sunflowers, Daisies, Asters, and Allies | 77 | May (peak) |
| 8 | Longhorn Steer's-Head | Dicentra uniflora | Poppy Family | 74 | May (peak) |
| 9 | Hooker's onion | Allium acuminatum | amaryllis, onions, and allies | 49 | Jun (rising) |
| 10 | Saskatoon | Amelanchier alnifolia | rose family | 38 | May (peak) |
| 11 | Bearberry | Arctostaphylos uva-ursi | heath family | 37 | May (peak) |
| 12 | Checker Lily | Fritillaria affinis | lily family | 28 | May (peak) |
| 13 | Dutchman's breeches | Dicentra cucullaria | Poppy Family | 27 | May (peak) |
| 14 | Edible Valerian | Valeriana edulis | honeysuckle family | 27 | Jun (rising) |
| 15 | Redstem Stork's-bill | Erodium cicutarium | Geranium family | 24 | Apr (past peak) |
| 16 | Upland Larkspur | Delphinium nuttallianum | buttercup family | 21 | May (peak) |
| 17 | Antelope Bitterbrush | Purshia tridentata | rose family | 20 | May (peak) |
| 18 | Barestem Biscuitroot | Lomatium nudicaule | carrot family | 20 | Apr (past peak) |
| 19 | Star-Flowered Lily-Of-The-Valley | Maianthemum stellatum | agave and allies | 18 | May (peak) |
| 20 | Yellow Salsify | Tragopogon dubius | Sunflowers, Daisies, Asters, and Allies | 17 | Jun (rising) |
| 21 | Sagebrush Buttercup | Ranunculus glaberrimus | buttercup family | 17 | Apr (past peak) |
| 22 | Annual Honesty | Lunaria annua | mustard family | 16 | Apr (past peak) |
| 23 | Red Osier Dogwood | Cornus sericea | Dogwood family | 15 | Jun (rising) |
| 24 | Yellow Iris | Iris pseudacorus | iris family | 14 | May (peak) |
| 25 | Golden Currant | Ribes aureum | Gooseberry Family | 14 | Apr (past peak) |
| 26 | Common Lilac | Syringa vulgaris | olive family | 14 | Apr (past peak) |
| 27 | Bitterroot | Lewisia rediviva | Pussypaw Family | 13 | Jun (rising) |
| 28 | Creeping Mahonia | Berberis repens | barberry family | 13 | Apr (past peak) |
| 29 | Common Dandelion | Taraxacum officinale | Sunflowers, Daisies, Asters, and Allies | 12 | Nov (rising) |
| 30 | Solomon's plume | Maianthemum racemosum | agave and allies | 12 | Jun (rising) |
| 31 | Poison Hemlock | Conium maculatum | carrot family | 11 | Jun (rising) |
| 32 | Chokecherry | Prunus virginiana | rose family | 11 | May (peak) |
| 33 | Black Locust | Robinia pseudoacacia | Legumes | 11 | Jun (rising) |
| 34 | Prairie Smoke | Geum triflorum | rose family | 11 | May (peak) |
| 35 | White Mariposa Lily | Calochortus eurycarpus | lily family | 10 | Jul (rising) |
| 36 | Common Yarrow | Achillea millefolium | Sunflowers, Daisies, Asters, and Allies | 10 | Jul (rising) |
| 37 | Western Skunk Cabbage | Lysichiton americanus | Arum Family | 9 | Apr (past peak) |
| 38 | common star-of-Bethlehem | Ornithogalum umbellatum | agave and allies | 9 | May (peak) |
| 39 | Oregon grape | Berberis aquifolium | barberry family | 9 | Apr (past peak) |
| 40 | Woodland Strawberry | Fragaria vesca | rose family | 8 | Jun (rising) |
| 41 | Orange Honeysuckle | Lonicera ciliosa | honeysuckle family | 8 | Jun (rising) |
| 42 | Shy Monkeyflower | Erythranthe nasuta | lopseed family | 8 | May (peak) |
| 43 | Henbit Deadnettle | Lamium amplexicaule | Mint Family | 7 | Apr (past peak) |
| 44 | Stream Violet | Viola glabella | Violet Family | 7 | May (peak) |
| 45 | Corn Gromwell | Buglossoides arvensis | borage family | 7 | Jun (rising) |
| 46 | Cornflower | Centaurea cyanus | Sunflowers, Daisies, Asters, and Allies | 7 | May (peak) |
| 47 | Dame's Rocket | Hesperis matronalis | mustard family | 6 | Jun (rising) |
| 48 | Miner's Lettuce | Claytonia perfoliata | Pussypaw Family | 6 | May (peak) |
| 49 | Lewis flax | Linum lewisii | Flax Family | 6 | May (peak) |
| 50 | California poppy | Eschscholzia californica | Poppy Family | 5 | May (peak) |