60 wildflowers were recorded blooming in Ohio in March in our iNaturalist sample; 11 of the top 50 are at their peak this month. The list is ranked by number of research-grade observations.
Top wildflowers in March

Lesser Celandine

Bloodroot
Virginia Springbeauty

Harbinger of Spring

Dutchman's breeches
Snow Trillium

Purple Cress

White Fawnlily

Virginia bluebells

Eastern Skunk Cabbage

Colt's-Foot

Cut-Leaved Toothwort
All wildflowers blooming in Ohio in March
| # | Species | Scientific name | Family | Obs. | Peak in state |
|---|---|---|---|---|---|
| 1 | Lesser Celandine | Ficaria verna | buttercup family | 745 | Apr (rising) |
| 2 | Bloodroot | Sanguinaria canadensis | Poppy Family | 645 | Apr (rising) |
| 3 | Virginia Springbeauty | Claytonia virginica | Pussypaw Family | 556 | Apr (rising) |
| 4 | Harbinger of Spring | Erigenia bulbosa | carrot family | 496 | Mar (peak) |
| 5 | Dutchman's breeches | Dicentra cucullaria | Poppy Family | 260 | Apr (rising) |
| 6 | Snow Trillium | Trillium nivale | Herb-Paris, False Hellebores, Trilliums and allies | 244 | Mar (peak) |
| 7 | Purple Cress | Cardamine douglassii | mustard family | 193 | Mar (peak) |
| 8 | White Fawnlily | Erythronium albidum | lily family | 192 | Apr (rising) |
| 9 | Virginia bluebells | Mertensia virginica | borage family | 175 | Apr (rising) |
| 10 | Eastern Skunk Cabbage | Symplocarpus foetidus | Arum Family | 167 | Mar (peak) |
| 11 | Colt's-Foot | Tussilago farfara | Sunflowers, Daisies, Asters, and Allies | 166 | Apr (rising) |
| 12 | Cut-Leaved Toothwort | Cardamine concatenata | mustard family | 164 | Apr (rising) |
| 13 | Northern Spicebush | Lindera benzoin | laurels | 131 | Apr (rising) |
| 14 | Red Deadnettle | Lamium purpureum | Mint Family | 128 | Apr (rising) |
| 15 | Common Snowdrop | Galanthus nivalis | amaryllis, onions, and allies | 115 | Mar (peak) |
| 16 | Lesser Periwinkle | Vinca minor | Dogbane Family | 89 | Apr (rising) |
| 17 | Yellow Trout Lily | Erythronium americanum | lily family | 84 | Apr (rising) |
| 18 | Sharp-Lobed Hepatica | Hepatica acutiloba | buttercup family | 74 | Apr (rising) |
| 19 | Siberian squill | Scilla siberica | agave and allies | 74 | Mar (peak) |
| 20 | Hairy Bittercress | Cardamine hirsuta | mustard family | 69 | Mar (peak) |
| 21 | Toadshade | Trillium sessile | Herb-Paris, False Hellebores, Trilliums and allies | 65 | Apr (rising) |
| 22 | False Rue Anemone | Enemion biternatum | buttercup family | 61 | Apr (rising) |
| 23 | Rue Anemone | Thalictrum thalictroides | buttercup family | 56 | Apr (rising) |
| 24 | Ground-Ivy | Glechoma hederacea | Mint Family | 47 | Apr (rising) |
| 25 | Bird's-Eye Speedwell | Veronica persica | Plantain Family | 46 | Apr (rising) |
| 26 | Marsh Marigold | Caltha palustris | buttercup family | 45 | Apr (rising) |
| 27 | Early Blue Cohosh | Caulophyllum giganteum | barberry family | 37 | Apr (rising) |
| 28 | Eastern Leatherwood | Dirca palustris | Stringbarks | 34 | Mar (peak) |
| 29 | Common Whitlowgrass | Draba verna | mustard family | 32 | Mar (peak) |
| 30 | Round-Lobed Hepatica | Hepatica americana | buttercup family | 31 | Apr (rising) |
| 31 | Squirrel Corn | Dicentra canadensis | Poppy Family | 26 | Apr (rising) |
| 32 | Henbit Deadnettle | Lamium amplexicaule | Mint Family | 24 | Apr (rising) |
| 33 | Azure Bluet | Houstonia caerulea | madder family | 24 | Apr (rising) |
| 34 | Common Dandelion | Taraxacum officinale | Sunflowers, Daisies, Asters, and Allies | 23 | Apr (rising) |
| 35 | Yellow Corydalis | Corydalis flavula | Poppy Family | 23 | Apr (rising) |
| 36 | Lawn daisy | Bellis perennis | Sunflowers, Daisies, Asters, and Allies | 18 | Apr (rising) |
| 37 | Callery pear | Pyrus calleryana | rose family | 17 | Mar (peak) |
| 38 | Trailing Arbutus | Epigaea repens | heath family | 16 | Apr (rising) |
| 39 | Large White Trillium | Trillium grandiflorum | Herb-Paris, False Hellebores, Trilliums and allies | 15 | Apr (rising) |
| 40 | Common Chickweed | Stellaria media | pink family | 14 | Apr (rising) |
| 41 | Blue Phlox | Phlox divaricata | phlox family | 14 | Apr (rising) |
| 42 | Canada Violet | Viola canadensis | Violet Family | 9 | Apr (rising) |
| 43 | Celandine Poppy | Chelidonium diphyllum | Poppy Family | 9 | Apr (rising) |
| 44 | Redstem Stork's-bill | Erodium cicutarium | Geranium family | 8 | Apr (rising) |
| 45 | Dwarf Larkspur | Delphinium tricorne | buttercup family | 8 | Apr (rising) |
| 46 | Smooth Yellow Violet | Viola eriocarpa | Violet Family | 8 | Apr (rising) |
| 47 | Red Maple | Acer rubrum | soapberry family | 7 | Mar (peak) |
| 48 | Field Penny-Cress | Thlaspi arvense | mustard family | 7 | Apr (rising) |
| 49 | American field pansy | Viola rafinesquei | Violet Family | 6 | Apr (rising) |
| 50 | Eastern Redbud | Cercis canadensis | Legumes | 5 | Apr (rising) |