A bloom calendar for Massachusetts built from 69,067 research-grade iNaturalist observations of plants in flower. May is the busiest bloom month. Pick a month to see what's flowering, or open a species for its state-by-state timing.
By month
Massachusetts wildflower calendar (top 40)
Fewer More observations (relative to each row's peak month)
Activity by month (all species)
Most-photographed wildflowers in Massachusetts
Pink Lady's Slipper
Northern Starflower
Azure Bluet
Red Trillium
Wood Anemone
Striped Wintergreen
Lesser Celandine
Trailing Arbutus
Common Jewelweed
Purple Loosestrife
Bloodroot
Wild Geranium
Garlic Mustard
Partridgeberry
Red Columbine
Ground-Ivy
