60 wildflowers were recorded blooming in New Hampshire in May in our iNaturalist sample; 40 of the top 50 are at their peak this month. The list is ranked by number of research-grade observations.
Top wildflowers in May
Painted Trillium

Northern Starflower

Pink Lady's Slipper

Red Trillium

Azure Bluet

Hobblebush

Fringed Polygala

Canada mayflower
Sessile Bellwort

Trailing Arbutus

Virginia strawberry
Wood Anemone
All wildflowers blooming in New Hampshire in May
| # | Species | Scientific name | Family | Obs. | Peak in state |
|---|---|---|---|---|---|
| 1 | Painted Trillium | Trillium undulatum | Herb-Paris, False Hellebores, Trilliums and allies | 939 | May (peak) |
| 2 | Northern Starflower | Lysimachia borealis | primrose family | 887 | May (peak) |
| 3 | Pink Lady's Slipper | Cypripedium acaule | Orchids | 719 | May (peak) |
| 4 | Red Trillium | Trillium erectum | Herb-Paris, False Hellebores, Trilliums and allies | 663 | May (peak) |
| 5 | Azure Bluet | Houstonia caerulea | madder family | 541 | May (peak) |
| 6 | Hobblebush | Viburnum lantanoides | elder family | 381 | May (peak) |
| 7 | Fringed Polygala | Polygaloides paucifolia | milkworts | 340 | May (peak) |
| 8 | Canada mayflower | Maianthemum canadense | agave and allies | 250 | May (peak) |
| 9 | Sessile Bellwort | Uvularia sessilifolia | Bellworts and allies | 229 | May (peak) |
| 10 | Trailing Arbutus | Epigaea repens | heath family | 223 | Apr (past peak) |
| 11 | Virginia strawberry | Fragaria virginiana | rose family | 208 | May (peak) |
| 12 | Wood Anemone | Anemonoides quinquefolia | buttercup family | 202 | May (peak) |
| 13 | Bluebead Lily | Clintonia borealis | lily family | 177 | Jun (rising) |
| 14 | Threeleaf Goldthread | Coptis trifolia | buttercup family | 177 | May (peak) |
| 15 | Yellow Trout Lily | Erythronium americanum | lily family | 170 | May (peak) |
| 16 | Rhodora | Rhododendron canadense | heath family | 144 | May (peak) |
| 17 | Dwarf Ginseng | Panax trifolius | ivy family | 136 | May (peak) |
| 18 | Canadian bunchberry | Cornus canadensis | Dogwood family | 126 | Jun (rising) |
| 19 | Red Columbine | Aquilegia canadensis | buttercup family | 124 | May (peak) |
| 20 | Creeping Foamflower | Tiarella stolonifera | saxifrage family | 122 | May (peak) |
| 21 | Carolina Springbeauty | Claytonia caroliniana | Pussypaw Family | 110 | May (peak) |
| 22 | Jack-in-the-Pulpit | Arisaema triphyllum | Arum Family | 103 | May (peak) |
| 23 | Wild Sarsaparilla | Aralia nudicaulis | ivy family | 89 | May (peak) |
| 24 | American fly-honeysuckle | Lonicera canadensis | honeysuckle family | 83 | May (peak) |
| 25 | Leatherleaf | Chamaedaphne calyculata | heath family | 75 | May (peak) |
| 26 | Colt's-Foot | Tussilago farfara | Sunflowers, Daisies, Asters, and Allies | 74 | Apr (past peak) |
| 27 | Red-Berried Elder | Sambucus racemosa | elder family | 74 | May (peak) |
| 28 | Moss Phlox | Phlox subulata | phlox family | 73 | May (peak) |
| 29 | Swamp Laurel | Kalmia polifolia | heath family | 71 | Jun (rising) |
| 30 | Garlic Mustard | Alliaria petiolata | mustard family | 68 | May (peak) |
| 31 | Marsh Marigold | Caltha palustris | buttercup family | 64 | May (peak) |
| 32 | golden Alexanders | Zizia aurea | carrot family | 59 | May (peak) |
| 33 | Ground-Ivy | Glechoma hederacea | Mint Family | 56 | May (peak) |
| 34 | Bloodroot | Sanguinaria canadensis | Poppy Family | 55 | Apr (past peak) |
| 35 | Wild Geranium | Geranium maculatum | Geranium family | 53 | May (peak) |
| 36 | Greater celandine | Chelidonium majus | Poppy Family | 51 | May (peak) |
| 37 | Dutchman's breeches | Dicentra cucullaria | Poppy Family | 48 | May (peak) |
| 38 | Solomon's plume | Maianthemum racemosum | agave and allies | 48 | Jun (rising) |
| 39 | Lesser Periwinkle | Vinca minor | Dogbane Family | 44 | May (peak) |
| 40 | Nodding Trillium | Trillium cernuum | Herb-Paris, False Hellebores, Trilliums and allies | 44 | May (peak) |
| 41 | Lowbush Blueberry | Vaccinium angustifolium | heath family | 38 | May (peak) |
| 42 | Round-leaved Violet | Viola rotundifolia | Violet Family | 38 | Apr (past peak) |
| 43 | Chokecherry | Prunus virginiana | rose family | 35 | May (peak) |
| 44 | Carpet Bugle | Ajuga reptans | Mint Family | 33 | May (peak) |
| 45 | Autumn Olive | Elaeagnus umbellata | oleaster family | 33 | May (peak) |
| 46 | Black Cherry | Prunus serotina | rose family | 32 | May (peak) |
| 47 | Common Dandelion | Taraxacum officinale | Sunflowers, Daisies, Asters, and Allies | 30 | May (peak) |
| 48 | Dame's Rocket | Hesperis matronalis | mustard family | 30 | Jun (rising) |
| 49 | Robin's-Plantain | Erigeron pulchellus | Sunflowers, Daisies, Asters, and Allies | 28 | Jun (rising) |
| 50 | Virginia saxifrage | Micranthes virginiensis | saxifrage family | 28 | May (peak) |