60 wildflowers were recorded blooming in Ohio in April in our iNaturalist sample; 43 of the top 50 are at their peak this month. The list is ranked by number of research-grade observations.
Top wildflowers in April

Large White Trillium
Virginia Springbeauty

Dutchman's breeches

Yellow Trout Lily

Lesser Celandine

Bloodroot

Virginia bluebells

Squirrel Corn
Toadshade

Azure Bluet

Red Deadnettle

Rue Anemone
All wildflowers blooming in Ohio in April
| # | Species | Scientific name | Family | Obs. | Peak in state |
|---|---|---|---|---|---|
| 1 | Large White Trillium | Trillium grandiflorum | Herb-Paris, False Hellebores, Trilliums and allies | 1,944 | Apr (peak) |
| 2 | Virginia Springbeauty | Claytonia virginica | Pussypaw Family | 1,658 | Apr (peak) |
| 3 | Dutchman's breeches | Dicentra cucullaria | Poppy Family | 1,627 | Apr (peak) |
| 4 | Yellow Trout Lily | Erythronium americanum | lily family | 1,424 | Apr (peak) |
| 5 | Lesser Celandine | Ficaria verna | buttercup family | 1,400 | Apr (peak) |
| 6 | Bloodroot | Sanguinaria canadensis | Poppy Family | 1,290 | Apr (peak) |
| 7 | Virginia bluebells | Mertensia virginica | borage family | 1,227 | Apr (peak) |
| 8 | Squirrel Corn | Dicentra canadensis | Poppy Family | 837 | Apr (peak) |
| 9 | Toadshade | Trillium sessile | Herb-Paris, False Hellebores, Trilliums and allies | 820 | Apr (peak) |
| 10 | Azure Bluet | Houstonia caerulea | madder family | 693 | Apr (peak) |
| 11 | Red Deadnettle | Lamium purpureum | Mint Family | 577 | Apr (peak) |
| 12 | Rue Anemone | Thalictrum thalictroides | buttercup family | 569 | Apr (peak) |
| 13 | Blue Phlox | Phlox divaricata | phlox family | 558 | Apr (peak) |
| 14 | Common Pawpaw | Asimina triloba | custard-apples | 529 | Apr (peak) |
| 15 | White Fawnlily | Erythronium albidum | lily family | 513 | Apr (peak) |
| 16 | Cut-Leaved Toothwort | Cardamine concatenata | mustard family | 491 | Apr (peak) |
| 17 | Red Trillium | Trillium erectum | Herb-Paris, False Hellebores, Trilliums and allies | 432 | Apr (peak) |
| 18 | Garlic Mustard | Alliaria petiolata | mustard family | 362 | Apr (peak) |
| 19 | Jack-in-the-Pulpit | Arisaema triphyllum | Arum Family | 343 | May (rising) |
| 20 | Marsh Marigold | Caltha palustris | buttercup family | 327 | Apr (peak) |
| 21 | Drooping Trillium | Trillium flexipes | Herb-Paris, False Hellebores, Trilliums and allies | 308 | Apr (peak) |
| 22 | Red Columbine | Aquilegia canadensis | buttercup family | 257 | May (rising) |
| 23 | False Rue Anemone | Enemion biternatum | buttercup family | 246 | Apr (peak) |
| 24 | Jacob's ladder | Polemonium reptans | phlox family | 244 | Apr (peak) |
| 25 | Lesser Periwinkle | Vinca minor | Dogbane Family | 241 | Apr (peak) |
| 26 | Celandine Poppy | Chelidonium diphyllum | Poppy Family | 237 | Apr (peak) |
| 27 | Wild Geranium | Geranium maculatum | Geranium family | 228 | May (rising) |
| 28 | Ground-Ivy | Glechoma hederacea | Mint Family | 224 | Apr (peak) |
| 29 | Twoleaf Miterwort | Mitella diphylla | saxifrage family | 217 | Apr (peak) |
| 30 | Canada Violet | Viola canadensis | Violet Family | 203 | Apr (peak) |
| 31 | American bladdernut | Staphylea trifolia | bladdernut family | 190 | Apr (peak) |
| 32 | Eastern Redbud | Cercis canadensis | Legumes | 185 | Apr (peak) |
| 33 | Mayapple | Podophyllum peltatum | barberry family | 183 | May (rising) |
| 34 | Purple Cress | Cardamine douglassii | mustard family | 175 | Mar (past peak) |
| 35 | Colt's-Foot | Tussilago farfara | Sunflowers, Daisies, Asters, and Allies | 168 | Apr (peak) |
| 36 | Dwarf Larkspur | Delphinium tricorne | buttercup family | 167 | Apr (peak) |
| 37 | Flowering Dogwood | Cornus florida | Dogwood family | 161 | May (rising) |
| 38 | Northern Spicebush | Lindera benzoin | laurels | 158 | Apr (peak) |
| 39 | Early Blue Cohosh | Caulophyllum giganteum | barberry family | 121 | Apr (peak) |
| 40 | Wood Anemone | Anemonoides quinquefolia | buttercup family | 118 | Apr (peak) |
| 41 | Annual Honesty | Lunaria annua | mustard family | 116 | Apr (peak) |
| 42 | Smooth Yellow Violet | Viola eriocarpa | Violet Family | 115 | Apr (peak) |
| 43 | Red-Berried Elder | Sambucus racemosa | elder family | 113 | Apr (peak) |
| 44 | Common Dandelion | Taraxacum officinale | Sunflowers, Daisies, Asters, and Allies | 109 | Apr (peak) |
| 45 | Fire Pink | Silene virginica | pink family | 108 | May (rising) |
| 46 | Lawn daisy | Bellis perennis | Sunflowers, Daisies, Asters, and Allies | 105 | Apr (peak) |
| 47 | Long-spurred violet | Viola rostrata | Violet Family | 102 | Apr (peak) |
| 48 | Cream Violet | Viola striata | Violet Family | 102 | Apr (peak) |
| 49 | Largeflower Bellwort | Uvularia grandiflora | Bellworts and allies | 99 | Apr (peak) |
| 50 | Sharp-Lobed Hepatica | Hepatica acutiloba | buttercup family | 96 | Apr (peak) |