Based on 1,315 research-grade iNaturalist flowering observations in New York, Garlic Mustard blooms mainly from April to May, peaking in April. It ranks #11 among wildflowers recorded in the state in our data.
Alliaria petiolata
Garlic Mustard in New York by month
Bars show research-grade observations per month. They mix true seasonality with how often people are outdoors, so treat small numbers with caution.
Also in bloom in New York in April

Lesser Celandine

Bloodroot

Yellow Trout Lily

Red Deadnettle

Red Trillium

Dutchman's breeches
Virginia Springbeauty

Large White Trillium
Places to look in New York
New York Botanical Garden
Botanical GardenBrooklyn Botanic Garden
Adirondack Park
Queens Botanical Garden
Franklin D. Roosevelt Four Freedoms Park
Planting Fields Arboretum State Historic Park
FAQ
When does Garlic Mustard bloom in New York?
Mainly April–May, with the most records in April.
How common is Garlic Mustard in New York?
It ranks #11 by number of iNaturalist flowering observations among wildflowers in New York (1,315 records in our sample).