60 wildflowers were recorded blooming in Massachusetts in April in our iNaturalist sample; 33 of the top 50 are at their peak this month. The list is ranked by number of research-grade observations.
Top wildflowers in April

Red Trillium

Lesser Celandine

Bloodroot

Trailing Arbutus

Azure Bluet

Lesser Periwinkle

Norway maple
Wood Anemone

Ground-Ivy

Yellow Trout Lily

Marsh Marigold

Eastern Skunk Cabbage
All wildflowers blooming in Massachusetts in April
| # | Species | Scientific name | Family | Obs. | Peak in state |
|---|---|---|---|---|---|
| 1 | Red Trillium | Trillium erectum | Herb-Paris, False Hellebores, Trilliums and allies | 755 | Apr (peak) |
| 2 | Lesser Celandine | Ficaria verna | buttercup family | 752 | Apr (peak) |
| 3 | Bloodroot | Sanguinaria canadensis | Poppy Family | 678 | Apr (peak) |
| 4 | Trailing Arbutus | Epigaea repens | heath family | 658 | Apr (peak) |
| 5 | Azure Bluet | Houstonia caerulea | madder family | 433 | May (rising) |
| 6 | Lesser Periwinkle | Vinca minor | Dogbane Family | 324 | Apr (peak) |
| 7 | Norway maple | Acer platanoides | soapberry family | 307 | Apr (peak) |
| 8 | Wood Anemone | Anemonoides quinquefolia | buttercup family | 303 | May (rising) |
| 9 | Ground-Ivy | Glechoma hederacea | Mint Family | 295 | Apr (peak) |
| 10 | Yellow Trout Lily | Erythronium americanum | lily family | 281 | Apr (peak) |
| 11 | Marsh Marigold | Caltha palustris | buttercup family | 278 | Apr (peak) |
| 12 | Eastern Skunk Cabbage | Symplocarpus foetidus | Arum Family | 229 | Mar (past peak) |
| 13 | Garlic Mustard | Alliaria petiolata | mustard family | 215 | May (rising) |
| 14 | Northern Spicebush | Lindera benzoin | laurels | 203 | Apr (peak) |
| 15 | Red Deadnettle | Lamium purpureum | Mint Family | 201 | Apr (peak) |
| 16 | Red Maple | Acer rubrum | soapberry family | 198 | Apr (peak) |
| 17 | Siberian squill | Scilla siberica | agave and allies | 179 | Apr (peak) |
| 18 | Colt's-Foot | Tussilago farfara | Sunflowers, Daisies, Asters, and Allies | 159 | Apr (peak) |
| 19 | Common Whitlowgrass | Draba verna | mustard family | 152 | Apr (peak) |
| 20 | Dutchman's breeches | Dicentra cucullaria | Poppy Family | 139 | Apr (peak) |
| 21 | Hairy Bittercress | Cardamine hirsuta | mustard family | 137 | Apr (peak) |
| 22 | Common Dandelion | Taraxacum officinale | Sunflowers, Daisies, Asters, and Allies | 123 | Apr (peak) |
| 23 | Carolina Springbeauty | Claytonia caroliniana | Pussypaw Family | 117 | Apr (peak) |
| 24 | Round-Lobed Hepatica | Hepatica americana | buttercup family | 95 | Apr (peak) |
| 25 | Annual Honesty | Lunaria annua | mustard family | 94 | May (rising) |
| 26 | Moss Phlox | Phlox subulata | phlox family | 90 | May (rising) |
| 27 | Sessile Bellwort | Uvularia sessilifolia | Bellworts and allies | 83 | May (rising) |
| 28 | Callery pear | Pyrus calleryana | rose family | 73 | Apr (peak) |
| 29 | Early Blue Cohosh | Caulophyllum giganteum | barberry family | 73 | Apr (peak) |
| 30 | American fly-honeysuckle | Lonicera canadensis | honeysuckle family | 70 | Apr (peak) |
| 31 | Henbit Deadnettle | Lamium amplexicaule | Mint Family | 67 | Apr (peak) |
| 32 | Lowbush Blueberry | Vaccinium angustifolium | heath family | 63 | May (rising) |
| 33 | Dwarf Ginseng | Panax trifolius | ivy family | 59 | May (rising) |
| 34 | Common Snowdrop | Galanthus nivalis | amaryllis, onions, and allies | 58 | Mar (past peak) |
| 35 | Bearberry | Arctostaphylos uva-ursi | heath family | 57 | May (rising) |
| 36 | Common Serviceberry | Amelanchier arborea | rose family | 55 | Apr (peak) |
| 37 | Leatherleaf | Chamaedaphne calyculata | heath family | 54 | Apr (peak) |
| 38 | Red Columbine | Aquilegia canadensis | buttercup family | 52 | May (rising) |
| 39 | Large White Trillium | Trillium grandiflorum | Herb-Paris, False Hellebores, Trilliums and allies | 52 | May (rising) |
| 40 | Threeleaf Goldthread | Coptis trifolia | buttercup family | 49 | May (rising) |
| 41 | Box Elder | Acer negundo | soapberry family | 45 | Apr (peak) |
| 42 | Squirrel Corn | Dicentra canadensis | Poppy Family | 44 | May (rising) |
| 43 | Virginia bluebells | Mertensia virginica | borage family | 41 | May (rising) |
| 44 | Redstem Stork's-bill | Erodium cicutarium | Geranium family | 39 | Apr (peak) |
| 45 | Eastern Leatherwood | Dirca palustris | Stringbarks | 37 | Apr (peak) |
| 46 | Round-leaved Violet | Viola rotundifolia | Violet Family | 37 | Apr (peak) |
| 47 | Virginia saxifrage | Micranthes virginiensis | saxifrage family | 37 | Apr (peak) |
| 48 | Jack-in-the-Pulpit | Arisaema triphyllum | Arum Family | 33 | May (rising) |
| 49 | Virginia Springbeauty | Claytonia virginica | Pussypaw Family | 28 | Apr (peak) |
| 50 | Shepherd's-Purse | Capsella bursa-pastoris | mustard family | 26 | Apr (peak) |