Chestnut-backed Chickadee house dimensions
The Chestnut-backed Chickadee nests in cavity or nest box with a thick fur lining A box built to its measurements — and no bigger — is what makes it choose yours.
The specifications
- Entrance hole
- 1 1/8 in
- Floor (inside)
- 4 × 4 in
- Mounting height
- 5–15 ft
- Bird size
- 4.3–4.7 in, 0.3–0.4 oz
- Clutch
- 5–7 eggs
- Incubation
- 12–18 days
- Time in nest
- 18–21 days
- Broods
- 1 per season
Build and mounting checklist
- Drill the entrance to exactly 1 1/8 in — oversized holes let in European Starlings and larger predators.
- No outside perch: cavity nesters don't need one, and it helps House Sparrows and predators.
- Unpainted interior, 3/4-inch untreated wood (cedar or pine) or poly-lumber for insulation.
- Drainage holes in the floor corners and ventilation gaps under the roof.
- A side or front panel that opens so you can monitor and clean the box.
- Rough or grooved inner front wall so nestlings can climb out.
- Pole mount with a stovepipe or cone baffle to stop snakes, raccoons and cats.
When to put up a Chestnut-backed Chickadee box, by state
Boxes should be up and clean a month before local nesting starts. Dates shift with latitude:
| Place | Up by | Nesting | Clean out |
|---|---|---|---|
| California | February | March–June | July |
| Idaho | March | April–June | July |
| Oregon | March | April–June | July |
| Washington | March | April–June | July |
| Alaska | April | May–June | July |
| British Columbia | April | May–June | July |
| Montana | April | May–June | July |
Full Chestnut-backed Chickadee species guide →
Frequently asked
What size hole does a Chestnut-backed Chickadee need?
1 1/8 in. A hole cut to this size admits the Chestnut-backed Chickadee (4.3–4.7 in) while keeping out larger competitors.
How big should a Chestnut-backed Chickadee house be inside?
A floor of 4 × 4 in. The Chestnut-backed Chickadee lays 5–7 eggs, so the floor has to hold the full clutch plus growing nestlings.
How high should I mount a Chestnut-backed Chickadee box?
5–15 ft. Mount on a pole with a predator baffle where possible rather than a tree or fence.
How long does a Chestnut-backed Chickadee use the box?
Incubation takes 12–18 days and the young stay in the nest 18–21 days. Broods per year: 1 per season.
Sources
- Chestnut-backed Chickadee — All About Birds, Cornell Lab of Ornithology
- Chestnut-backed Chickadee life history — Cornell Lab of Ornithology
- Chestnut-backed Chickadee — Audubon Guide to North American Birds
- NestWatch nest box plans and species requirements — Cornell Lab
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.