Brown Thrashers in Colorado
When brown thrashers are present in Colorado, when they nest, which native Colorado plants feed them, and how to host them in a USDA 3a–7b yard.
- Status in Colorado
- Summer breeder
- Nesting window
- April–July
- Broods
- 1–2 per season
- Hardiness zones
- USDA 3a–7b
When to expect brown thrashers in Colorado
Brown Thrashers are summer residents in Colorado, arriving shortly before nesting begins in April and leaving after the young are independent. Through the season they feed on beetles and caterpillars.
Semi-arid high plains in the east and the Rocky Mountains through the center, with most backyards between 5,000 and 7,000 ft.
Nesting in Colorado
Across Colorado, brown thrashers typically nest from April–July. Nest site: twig cup low in thorny shrubs. Females lay 3–5 eggs, incubate for 11–14 days, and young leave the nest after 9–13 days.
Warm, dry days and cool nights; afternoon storms are common in July and August.
- Brown Thrashers don't use nest boxes. Keep dense native shrubs and trees such as smooth sumac, virginia creeper, pin cherry for nest sites.
- Delay heavy pruning of shrubs until after July.
Native Colorado plants that attract brown thrashers
Of the regional native plants we track for Colorado, these 8 provide food or cover brown thrashers use:
Red fruit heads hang on through winter.
Blue fruit on red stems in early fall.
Late nectar for insects and fall seed for sparrows.
Insect-rich in fall and seed in winter.
Fast-growing northern cherry with midsummer fruit.
Dark summer fruit and heavy caterpillar load.
White fruit and red winter stems; good thicket cover.
Berry-like cones feed bluebirds, solitaires and waxwings in winter.
Feeding brown thrashers through the Colorado year
Thrashers sweep leaf litter with their bills; keep leaves under shrubs.
- Best foods: Suet, Cracked corn, Mealworms.
- In Colorado's summer: offer water and insect foods; natural food is abundant.
Full diet breakdown for brown thrashers · Best feeder for brown thrashers
Frequently asked
Are brown thrashers in Colorado year-round?
No. Brown Thrashers are summer breeders in Colorado and leave for the winter.
When do brown thrashers nest in Colorado?
Nesting in Colorado typically runs April–July, with 1–2 per season. Clutches are 3–5 eggs, incubated for 11–14 days.
What native plants attract brown thrashers in Colorado?
Smooth sumac, Virginia creeper, New England aster, Tall goldenrod, Pin cherry, Chokecherry, Red-osier dogwood, Rocky Mountain juniper are native plants in Colorado that provide food or cover for brown thrashers.
Brown Thrashers in other regions
Other backyard birds in Colorado
Sources
- Brown Thrasher — All About Birds, Cornell Lab of Ornithology
- Brown Thrasher life history — Cornell Lab of Ornithology
- Brown Thrasher — Audubon Guide to North American Birds
- eBird region overview and bar charts — Colorado
- 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.