60 wildflowers were recorded blooming in Connecticut in April in our iNaturalist sample; 36 of the top 50 are at their peak this month. The list is ranked by number of research-grade observations.
Top wildflowers in April

Bloodroot

Red Trillium

Yellow Trout Lily

Azure Bluet

Lesser Celandine

Dutchman's breeches
Wood Anemone

Marsh Marigold

Northern Spicebush
Virginia Springbeauty

Red Deadnettle
Garlic Mustard
All wildflowers blooming in Connecticut in April
| # | Species | Scientific name | Family | Obs. | Peak in state |
|---|---|---|---|---|---|
| 1 | Bloodroot | Sanguinaria canadensis | Poppy Family | 404 | Apr (peak) |
| 2 | Red Trillium | Trillium erectum | Herb-Paris, False Hellebores, Trilliums and allies | 372 | Apr (peak) |
| 3 | Yellow Trout Lily | Erythronium americanum | lily family | 272 | Apr (peak) |
| 4 | Azure Bluet | Houstonia caerulea | madder family | 255 | May (rising) |
| 5 | Lesser Celandine | Ficaria verna | buttercup family | 229 | Apr (peak) |
| 6 | Dutchman's breeches | Dicentra cucullaria | Poppy Family | 227 | Apr (peak) |
| 7 | Wood Anemone | Anemonoides quinquefolia | buttercup family | 190 | Apr (peak) |
| 8 | Marsh Marigold | Caltha palustris | buttercup family | 133 | Apr (peak) |
| 9 | Northern Spicebush | Lindera benzoin | laurels | 99 | Apr (peak) |
| 10 | Virginia Springbeauty | Claytonia virginica | Pussypaw Family | 96 | Apr (peak) |
| 11 | Red Deadnettle | Lamium purpureum | Mint Family | 92 | Apr (peak) |
| 12 | Garlic Mustard | Alliaria petiolata | mustard family | 91 | May (rising) |
| 13 | Lesser Periwinkle | Vinca minor | Dogbane Family | 76 | Apr (peak) |
| 14 | Ground-Ivy | Glechoma hederacea | Mint Family | 75 | Apr (peak) |
| 15 | Dwarf Ginseng | Panax trifolius | ivy family | 68 | May (rising) |
| 16 | Rue Anemone | Thalictrum thalictroides | buttercup family | 66 | Apr (peak) |
| 17 | Trailing Arbutus | Epigaea repens | heath family | 57 | Apr (peak) |
| 18 | Eastern Skunk Cabbage | Symplocarpus foetidus | Arum Family | 54 | Mar (past peak) |
| 19 | Red Columbine | Aquilegia canadensis | buttercup family | 42 | May (rising) |
| 20 | Moss Phlox | Phlox subulata | phlox family | 41 | May (rising) |
| 21 | Norway maple | Acer platanoides | soapberry family | 40 | Apr (peak) |
| 22 | Colt's-Foot | Tussilago farfara | Sunflowers, Daisies, Asters, and Allies | 39 | Apr (peak) |
| 23 | Jack-in-the-Pulpit | Arisaema triphyllum | Arum Family | 37 | May (rising) |
| 24 | Sessile Bellwort | Uvularia sessilifolia | Bellworts and allies | 32 | May (rising) |
| 25 | Red Maple | Acer rubrum | soapberry family | 30 | Apr (peak) |
| 26 | Siberian squill | Scilla siberica | agave and allies | 29 | Apr (peak) |
| 27 | Round-Lobed Hepatica | Hepatica americana | buttercup family | 28 | Apr (peak) |
| 28 | Annual Honesty | Lunaria annua | mustard family | 27 | May (rising) |
| 29 | Virginia bluebells | Mertensia virginica | borage family | 25 | Apr (peak) |
| 30 | Fringed Polygala | Polygaloides paucifolia | milkworts | 25 | May (rising) |
| 31 | Common Snowdrop | Galanthus nivalis | amaryllis, onions, and allies | 23 | Apr (peak) |
| 32 | Small-Flowered Buttercup | Ranunculus abortivus | buttercup family | 23 | Apr (peak) |
| 33 | Common Whitlowgrass | Draba verna | mustard family | 22 | Apr (peak) |
| 34 | Virginia saxifrage | Micranthes virginiensis | saxifrage family | 20 | Apr (peak) |
| 35 | Hairy Bittercress | Cardamine hirsuta | mustard family | 18 | Apr (peak) |
| 36 | Common Dandelion | Taraxacum officinale | Sunflowers, Daisies, Asters, and Allies | 17 | Apr (peak) |
| 37 | Sassafras | Sassafras albidum | laurels | 17 | Apr (peak) |
| 38 | Greater celandine | Chelidonium majus | Poppy Family | 17 | May (rising) |
| 39 | Two-leaved Toothwort | Cardamine diphylla | mustard family | 17 | Apr (peak) |
| 40 | American fly-honeysuckle | Lonicera canadensis | honeysuckle family | 16 | Apr (peak) |
| 41 | Henbit Deadnettle | Lamium amplexicaule | Mint Family | 15 | Apr (peak) |
| 42 | European field pansy | Viola arvensis | Violet Family | 15 | Apr (peak) |
| 43 | Round-leaved Violet | Viola rotundifolia | Violet Family | 15 | Apr (peak) |
| 44 | Carpet Bugle | Ajuga reptans | Mint Family | 13 | May (rising) |
| 45 | Callery pear | Pyrus calleryana | rose family | 13 | Apr (peak) |
| 46 | Threeleaf Goldthread | Coptis trifolia | buttercup family | 13 | Apr (peak) |
| 47 | Red-Berried Elder | Sambucus racemosa | elder family | 11 | May (rising) |
| 48 | Common Serviceberry | Amelanchier arborea | rose family | 9 | Apr (peak) |
| 49 | Eastern Leatherwood | Dirca palustris | Stringbarks | 9 | Apr (peak) |
| 50 | Lowbush Blueberry | Vaccinium angustifolium | heath family | 9 | May (rising) |