When do tree swallows arrive in Arizona?
The Tree Swallow is a summer breeder in Arizona — here is when to expect it, when it leaves, and how to be ready.
Tree Swallow timing in Arizona
- Arrives
- Around March
- Leaves
- By July
- Status here
- Summer breeder
- Nesting season
- April–June
- Present roughly
- March–July
In Arizona, tree swallows are present through the warm months, arriving around March and heading south again by July.
These windows are set by latitude: Arizona sits in the southern part of this species' range, so timing here runs earlier than the continental average — spring comes sooner, and the birds follow 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 tree swallows are expected in Arizona. 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 March is the time to act. Have feeders cleaned, filled and out by early March — the first tree swallows into Arizona are scouting for reliable food, and a station that's ready early gets added to their route.
Tree swallows 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. Tree Swallow nest box dimensions and mounting →
Once nesting begins around April, adults switch to protein-rich food for their young and visits to feeders become quick and purposeful. Expect the busiest activity at dawn.
What tree swallows eat while they're here
- Flies, mayflies and dragonflies
Tree swallows readily take bluebird-style nest boxes; mount boxes in pairs 15–25 ft apart to share with bluebirds.
Full Tree Swallow diet guide → · Best feeder for tree swallows →
Native plants that hold tree swallows in Arizona
Food keeps a migrant for a day; habitat keeps it for the season. These Arizona-native plants are known to attract tree swallows:
Summer fruit and one of the top caterpillar host trees.
Late-summer berry clusters taken by over 40 bird species.
Insect-rich in fall and seed in winter.
Dark summer fruit and heavy caterpillar load.
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.
Seed pods and insect-rich spring bloom.
Keep exploring
Frequently asked
When do tree swallows arrive in Arizona?
tree swallows typically arrive in Arizona around March, with nesting underway by April. Timing can shift a week or two with the weather in any given year.
When do tree swallows leave Arizona?
Most tree swallows have left Arizona by July. They spend the winter farther south and return the following spring.
Do tree swallows stay in Arizona all year?
No — in Arizona the Tree Swallow is a summer breeder, present roughly March–July. Outside that window it is rarely seen in the state.
What should I put out before tree swallows arrive in Arizona?
Have feeders up and clean by early March — first arrivals scout reliable food sources. Good offerings for this species: flies, mayflies and dragonflies.
Sources
- Tree Swallow — All About Birds, Cornell Lab of Ornithology
- Tree Swallow life history — Cornell Lab of Ornithology
- Tree Swallow — Audubon Guide to North American Birds
- NestWatch nest box plans and species requirements — Cornell Lab
- eBird region overview and bar charts — Arizona
- 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.