When do mountain bluebirds arrive in Montana?
The Mountain Bluebird is a summer breeder in Montana — here is when to expect it, when it leaves, and how to be ready.
Mountain Bluebird timing in Montana
- Arrives
- Around May
- Leaves
- By August
- Status here
- Summer breeder
- Nesting season
- June–July
- Present roughly
- May–August
In Montana, mountain bluebirds are present through the warm months, arriving around May and heading south again by August.
These windows are set by latitude: Montana 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 Montana. 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 Montana 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 Montana
Food keeps a migrant for a day; habitat keeps it for the season. These Montana-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.
Insect-rich in fall and seed in winter.
Catkin seed feeds redpolls and siskins all winter.
Dark summer fruit and heavy caterpillar load.
White fruit and red winter stems; good thicket cover.
Red fruit persists until late winter when other food is gone.
Sweet dry fruit on the branch all winter.
Keep exploring
Frequently asked
When do mountain bluebirds arrive in Montana?
mountain bluebirds typically arrive in Montana 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 Montana?
Most mountain bluebirds have left Montana by August. They spend the winter farther south and return the following spring.
Do mountain bluebirds stay in Montana all year?
No — in Montana 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 Montana?
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 — Montana
- 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.