60 wildflowers were recorded blooming in Indiana in April in our iNaturalist sample; 39 of the top 50 are at their peak this month. The list is ranked by number of research-grade observations.
Top wildflowers in April

Dutchman's breeches
Prairie Trillium
Virginia Springbeauty

Bloodroot

Yellow Trout Lily

Virginia bluebells
Toadshade

Squirrel Corn

Henbit Deadnettle

Celandine Poppy

Red Deadnettle
False Rue Anemone
All wildflowers blooming in Indiana in April
| # | Species | Scientific name | Family | Obs. | Peak in state |
|---|---|---|---|---|---|
| 1 | Dutchman's breeches | Dicentra cucullaria | Poppy Family | 835 | Apr (peak) |
| 2 | Prairie Trillium | Trillium recurvatum | Herb-Paris, False Hellebores, Trilliums and allies | 651 | Apr (peak) |
| 3 | Virginia Springbeauty | Claytonia virginica | Pussypaw Family | 493 | Apr (peak) |
| 4 | Bloodroot | Sanguinaria canadensis | Poppy Family | 473 | Apr (peak) |
| 5 | Yellow Trout Lily | Erythronium americanum | lily family | 471 | Apr (peak) |
| 6 | Virginia bluebells | Mertensia virginica | borage family | 460 | Apr (peak) |
| 7 | Toadshade | Trillium sessile | Herb-Paris, False Hellebores, Trilliums and allies | 356 | Apr (peak) |
| 8 | Squirrel Corn | Dicentra canadensis | Poppy Family | 328 | Apr (peak) |
| 9 | Henbit Deadnettle | Lamium amplexicaule | Mint Family | 293 | Apr (peak) |
| 10 | Celandine Poppy | Chelidonium diphyllum | Poppy Family | 282 | Apr (peak) |
| 11 | Red Deadnettle | Lamium purpureum | Mint Family | 248 | Apr (peak) |
| 12 | False Rue Anemone | Enemion biternatum | buttercup family | 241 | Apr (peak) |
| 13 | White Fawnlily | Erythronium albidum | lily family | 236 | Apr (peak) |
| 14 | Common Pawpaw | Asimina triloba | custard-apples | 228 | Apr (peak) |
| 15 | Large White Trillium | Trillium grandiflorum | Herb-Paris, False Hellebores, Trilliums and allies | 226 | May (rising) |
| 16 | Blue Phlox | Phlox divaricata | phlox family | 214 | Apr (peak) |
| 17 | Lesser Celandine | Ficaria verna | buttercup family | 209 | Apr (peak) |
| 18 | Cut-Leaved Toothwort | Cardamine concatenata | mustard family | 183 | Apr (peak) |
| 19 | Rue Anemone | Thalictrum thalictroides | buttercup family | 177 | Apr (peak) |
| 20 | Garlic Mustard | Alliaria petiolata | mustard family | 172 | Apr (peak) |
| 21 | Drooping Trillium | Trillium flexipes | Herb-Paris, False Hellebores, Trilliums and allies | 150 | Apr (peak) |
| 22 | Wild Geranium | Geranium maculatum | Geranium family | 141 | Apr (peak) |
| 23 | Mayapple | Podophyllum peltatum | barberry family | 128 | Apr (peak) |
| 24 | Jack-in-the-Pulpit | Arisaema triphyllum | Arum Family | 118 | Apr (peak) |
| 25 | Largeflower Bellwort | Uvularia grandiflora | Bellworts and allies | 111 | Apr (peak) |
| 26 | Harbinger of Spring | Erigenia bulbosa | carrot family | 103 | Mar (past peak) |
| 27 | Ground-Ivy | Glechoma hederacea | Mint Family | 102 | Apr (peak) |
| 28 | Eastern Redbud | Cercis canadensis | Legumes | 98 | Apr (peak) |
| 29 | Fire Pink | Silene virginica | pink family | 94 | May (rising) |
| 30 | American bladdernut | Staphylea trifolia | bladdernut family | 83 | Apr (peak) |
| 31 | Reflexed Wild Ginger | Asarum reflexum | birthwort family | 81 | Apr (peak) |
| 32 | Smooth Yellow Violet | Viola eriocarpa | Violet Family | 77 | Apr (peak) |
| 33 | Dwarf Larkspur | Delphinium tricorne | buttercup family | 75 | Apr (peak) |
| 34 | Marsh Marigold | Caltha palustris | buttercup family | 68 | Apr (peak) |
| 35 | Flowering Dogwood | Cornus florida | Dogwood family | 66 | Apr (peak) |
| 36 | Northern Spicebush | Lindera benzoin | laurels | 60 | Mar (past peak) |
| 37 | Red Columbine | Aquilegia canadensis | buttercup family | 58 | May (rising) |
| 38 | Blue Cohosh | Caulophyllum thalictroides | barberry family | 57 | Apr (peak) |
| 39 | Lesser Periwinkle | Vinca minor | Dogbane Family | 56 | Apr (peak) |
| 40 | Golden Ragwort | Packera aurea | Sunflowers, Daisies, Asters, and Allies | 55 | Apr (peak) |
| 41 | Purple Cress | Cardamine douglassii | mustard family | 54 | Mar (past peak) |
| 42 | Common Dandelion | Taraxacum officinale | Sunflowers, Daisies, Asters, and Allies | 51 | Apr (peak) |
| 43 | Star Chickweed | Stellaria pubera | pink family | 51 | Apr (peak) |
| 44 | Jacob's ladder | Polemonium reptans | phlox family | 48 | Apr (peak) |
| 45 | Butterweed | Packera glabella | Sunflowers, Daisies, Asters, and Allies | 46 | May (rising) |
| 46 | Miami Mist | Phacelia purshii | borage family | 46 | May (rising) |
| 47 | Catchweed Bedstraw | Galium aparine | madder family | 42 | May (rising) |
| 48 | Yellow Lady's Slipper | Cypripedium parviflorum | Orchids | 41 | Apr (peak) |
| 49 | Atlantic camas | Camassia scilloides | agave and allies | 39 | May (rising) |
| 50 | Canadian lousewort | Pedicularis canadensis | broomrape family | 38 | May (rising) |