60 wildflowers were recorded blooming in Connecticut in June in our iNaturalist sample; 37 of the top 50 are at their peak this month. The list is ranked by number of research-grade observations.
Top wildflowers in June

Partridgeberry

Mountain Laurel

Multiflora Rose

Common Milkweed

Bird's-Foot Trefoil

black-eyed Susan

Pink Lady's Slipper

Azure Bluet

Whorled Loosestrife

Red Clover

Yellow Star Grass

American black elderberry
All wildflowers blooming in Connecticut in June
| # | Species | Scientific name | Family | Obs. | Peak in state |
|---|---|---|---|---|---|
| 1 | Partridgeberry | Mitchella repens | madder family | 248 | Jun (peak) |
| 2 | Mountain Laurel | Kalmia latifolia | heath family | 200 | Jun (peak) |
| 3 | Multiflora Rose | Rosa multiflora | rose family | 147 | Jun (peak) |
| 4 | Common Milkweed | Asclepias syriaca | Dogbane Family | 83 | Jun (peak) |
| 5 | Bird's-Foot Trefoil | Lotus corniculatus | Legumes | 80 | Jun (peak) |
| 6 | black-eyed Susan | Rudbeckia hirta | Sunflowers, Daisies, Asters, and Allies | 75 | Jul (rising) |
| 7 | Pink Lady's Slipper | Cypripedium acaule | Orchids | 69 | May (past peak) |
| 8 | Azure Bluet | Houstonia caerulea | madder family | 67 | May (past peak) |
| 9 | Whorled Loosestrife | Lysimachia quadrifolia | primrose family | 67 | Jun (peak) |
| 10 | Red Clover | Trifolium pratense | Legumes | 65 | Jun (peak) |
| 11 | Yellow Star Grass | Hypoxis hirsuta | Stargrasses and allies | 57 | May (past peak) |
| 12 | American black elderberry | Sambucus canadensis | elder family | 55 | Jun (peak) |
| 13 | White Clover | Trifolium repens | Legumes | 49 | Jun (peak) |
| 14 | Mapleleaf Viburnum | Viburnum acerifolium | elder family | 49 | Jun (peak) |
| 15 | Border Privet | Ligustrum obtusifolium | olive family | 49 | Jun (peak) |
| 16 | Purple Crownvetch | Securigera varia | Legumes | 46 | Jun (peak) |
| 17 | Dame's Rocket | Hesperis matronalis | mustard family | 44 | May (past peak) |
| 18 | Sheep Laurel | Kalmia angustifolia | heath family | 41 | Jun (peak) |
| 19 | Wild Geranium | Geranium maculatum | Geranium family | 39 | May (past peak) |
| 20 | clasping Venus's looking glass | Triodanis perfoliata | bellflower family | 39 | Jun (peak) |
| 21 | Striped Wintergreen | Chimaphila maculata | heath family | 39 | Jul (rising) |
| 22 | Bittersweet Nightshade | Solanum dulcamara | nightshade family | 37 | Jun (peak) |
| 23 | Japanese honeysuckle | Lonicera japonica | honeysuckle family | 37 | Jun (peak) |
| 24 | Purple-Flowered Raspberry | Rubus odoratus | rose family | 33 | Jun (peak) |
| 25 | Deptford pink | Dianthus armeria | pink family | 31 | Jun (peak) |
| 26 | Common Yarrow | Achillea millefolium | Sunflowers, Daisies, Asters, and Allies | 30 | Jun (peak) |
| 27 | Sulphur Cinquefoil | Potentilla recta | rose family | 30 | Jun (peak) |
| 28 | Canada toadflax | Linaria canadensis | Plantain Family | 30 | Jun (peak) |
| 29 | Nipplewort | Lapsana communis | Sunflowers, Daisies, Asters, and Allies | 28 | Jun (peak) |
| 30 | Annual Fleabane | Erigeron annuus | Sunflowers, Daisies, Asters, and Allies | 27 | Jun (peak) |
| 31 | Butterfly Milkweed | Asclepias tuberosa | Dogbane Family | 25 | Jul (rising) |
| 32 | Tufted Vetch | Vicia cracca | Legumes | 24 | Jun (peak) |
| 33 | White Campion | Silene latifolia | pink family | 24 | Jun (peak) |
| 34 | Staghorn Sumac | Rhus typhina | Cashew Family | 23 | Jun (peak) |
| 35 | Hemp Dogbane | Apocynum cannabinum | Dogbane Family | 22 | Jul (rising) |
| 36 | Cucumber Root | Medeola virginiana | lily family | 21 | Jun (peak) |
| 37 | Heath Speedwell | Veronica officinalis | Plantain Family | 21 | Jun (peak) |
| 38 | Alder Buckthorn | Frangula alnus | buckthorn family | 20 | Jun (peak) |
| 39 | Northern Bush Honeysuckle | Diervilla lonicera | honeysuckle family | 20 | Jun (peak) |
| 40 | Red Columbine | Aquilegia canadensis | buttercup family | 19 | May (past peak) |
| 41 | Asiatic dayflower | Commelina communis | Spiderworts | 19 | Sep (rising) |
| 42 | American tuliptree | Liriodendron tulipifera | magnolia family | 18 | May (past peak) |
| 43 | creeping Jenny | Lysimachia nummularia | primrose family | 17 | Jun (peak) |
| 44 | Common Selfheal | Prunella vulgaris | Mint Family | 17 | Jul (rising) |
| 45 | Oxeye Daisy | Leucanthemum vulgare | Sunflowers, Daisies, Asters, and Allies | 17 | Jun (peak) |
| 46 | Alsike clover | Trifolium hybridum | Legumes | 16 | Jun (peak) |
| 47 | Spreading Dogbane | Apocynum androsaemifolium | Dogbane Family | 15 | Jun (peak) |
| 48 | Northern Blue Flag | Iris versicolor | iris family | 15 | Jun (peak) |
| 49 | Ribwort Plantain | Plantago lanceolata | Plantain Family | 15 | Jun (peak) |
| 50 | Common St. John's Wort | Hypericum perforatum | St. John's wort family | 15 | Jun (peak) |