When do hooded mergansers arrive in Wyoming?
The Hooded Merganser is a winter visitor in Wyoming — here is when to expect it, when it leaves, and how to be ready.
Hooded Merganser timing in Wyoming
- Arrives
- Around September
- Leaves
- By April
- Status here
- Winter visitor
- Present roughly
- September–April
In Wyoming, hooded mergansers are a cold-season bird, arriving around September and heading back north to breed by April.
These windows are set by latitude: Wyoming sits in the middle part of this species' range, so timing here tracks the continental average closely. In any given year, weather can move the first arrivals by a week or two either way.
Month by month in this state
Highlighted months are when hooded mergansers are expected in Wyoming. The edges of the window are the interesting weeks — first arrivals and last departures vary most from year to year.
Getting ready before they arrive
The week before September is the time to act. Have feeders cleaned, filled and out by early September — the first hooded mergansers into Wyoming are scouting for reliable food, and a station that's ready early gets added to their route.
Through the winter, consistent food matters more than variety — birds map dependable stations into their daily routes and rely on them hardest during cold snaps.
What hooded mergansers eat while they're here
- Small fish in ice-free water
Nests in tree cavities and wood-duck-style boxes near quiet wooded ponds and slow rivers.
Full Hooded Merganser diet guide → · Best feeder for hooded mergansers →
Native plants that hold hooded mergansers in Wyoming
Food keeps a migrant for a day; habitat keeps it for the season. These Wyoming-native plants are known to attract hooded mergansers:
Drought-hardy prairie oak with large acorns and a heavy insect load.
Late nectar for insects and fall seed for sparrows.
Insect-rich in fall and seed in winter.
Dark summer fruit and heavy caterpillar load.
Sweet dry fruit on the branch all winter.
Seeds and bark insects; pygmy nuthatch and woodpecker habitat.
Acorns for jays and woodpeckers across the southern Rockies.
Late-season bloom supports insects; seed for sparrows.
Keep exploring
Frequently asked
When do hooded mergansers arrive in Wyoming?
hooded mergansers typically arrive in Wyoming around September. Timing can shift a week or two with the weather in any given year.
When do hooded mergansers leave Wyoming?
Most hooded mergansers have left Wyoming by April. They spend the breeding season farther north and return in the fall.
Do hooded mergansers stay in Wyoming all year?
No — in Wyoming the Hooded Merganser is a winter visitor, present roughly September–April. Outside that window it is rarely seen in the state.
What should I put out before hooded mergansers arrive in Wyoming?
Have feeders up and clean by early September — first arrivals scout reliable food sources. Good offerings for this species: minnows, crayfish and aquatic insects.
Sources
- Hooded Merganser — All About Birds, Cornell Lab of Ornithology
- Hooded Merganser life history — Cornell Lab of Ornithology
- Hooded Merganser — Audubon Guide to North American Birds
- NestWatch nest box plans and species requirements — Cornell Lab
- eBird region overview and bar charts — Wyoming
- USDA Plant Hardiness Zone Map (2023)
- Audubon Native Plants Database
Timing reflects typical patterns for the region as a whole; local dates vary with elevation and year. Check the linked eBird bar charts for your county.