When do mountain bluebirds arrive in Wyoming?
The Mountain Bluebird is a summer breeder in Wyoming — here is when to expect it, when it leaves, and how to be ready.
Mountain Bluebird timing in Wyoming
- Arrives
- Around May
- Leaves
- By August
- Status here
- Summer breeder
- Nesting season
- June–July
- Present roughly
- May–August
In Wyoming, mountain bluebirds are present through the warm months, arriving around May and heading south again by August.
These windows are set by latitude: Wyoming sits in the middle part of this species' range, so timing here runs later than the continental average — the season starts later this far north and the birds wait for it. 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 mountain bluebirds 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 May is the time to act. Have feeders cleaned, filled and out by early May — the first mountain bluebirds into Wyoming are scouting for reliable food, and a station that's ready early gets added to their route.
Mountain bluebirds nest in cavities, so boxes need to be up and cleaned before arrival — a box mounted after they've claimed territories will usually sit empty until next year. Mountain Bluebird nest box dimensions and mounting →
Once nesting begins around June, adults switch to protein-rich food for their young and visits to feeders become quick and purposeful. Expect the busiest activity at dawn.
What mountain bluebirds eat while they're here
- Grasshoppers, beetles and caterpillars
Nests at high elevations in open country; takes nest boxes on fence lines.
Full Mountain Bluebird diet guide → · Best feeder for mountain bluebirds →
Native plants that hold mountain bluebirds in Wyoming
Food keeps a migrant for a day; habitat keeps it for the season. These Wyoming-native plants are known to attract mountain bluebirds:
Red fruit heads hang on through winter.
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.
White fruit and red winter stems; good thicket cover.
Sweet dry fruit on the branch all winter.
Berry-like cones feed bluebirds, solitaires and waxwings in winter.
Keep exploring
Frequently asked
When do mountain bluebirds arrive in Wyoming?
mountain bluebirds typically arrive in Wyoming around May, with nesting underway by June. Timing can shift a week or two with the weather in any given year.
When do mountain bluebirds leave Wyoming?
Most mountain bluebirds have left Wyoming by August. They spend the winter farther south and return the following spring.
Do mountain bluebirds stay in Wyoming all year?
No — in Wyoming the Mountain Bluebird is a summer breeder, present roughly May–August. Outside that window it is rarely seen in the state.
What should I put out before mountain bluebirds arrive in Wyoming?
Have feeders up and clean by early May — first arrivals scout reliable food sources. Good offerings for this species: grasshoppers, beetles and caterpillars.
Sources
- Mountain Bluebird — All About Birds, Cornell Lab of Ornithology
- Mountain Bluebird life history — Cornell Lab of Ornithology
- Mountain Bluebird — 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.