Common Grackle eggs
Pale blue to pearl gray, with brown and black blotches and scrawls, about 1.06–1.22 inches long — about 1.2 times the width of a US quarter. A Common Grackle lays 4–6 eggs, and they hatch after 13–14 days.
- Color
- Pale blue to pearl gray, with brown and black blotches and scrawls
- Length
- 1.06–1.22 in (27–31 mm)
- Width
- 0.79–0.87 in (20–22 mm)
- Eggs per clutch
- 4–6 eggs
- Incubation
- 13–14 days
- Broods per year
- 1–2 per season
- Nest
- Bulky cup in dense conifers, often in loose colonies
How to recognise a Common Grackle egg
- Color: pale blue to pearl gray, with brown and black blotches and scrawls. Markings vary between females and are often heaviest around the wide end; the same female tends to lay a similar pattern every time.
- Size: 27–31 mm long by 20–22 mm wide. For scale, a US quarter is 24.3 mm across, so this egg is about 1.2 times the width of a US quarter.
- Where you find it: bulky cup in dense conifers, often in loose colonies. Grackles do not normally use nest boxes.
- Clutch: 4–6 eggs. A nest with far more eggs than this may hold eggs from two females, or a cowbird egg laid by a brood parasite.
Eggs that look similar
These species lay eggs in the same color group, sorted by how close they are in length. Size and nest site usually settle it.
| Species | Egg | Length |
|---|---|---|
| Common Grackle | pale blue to pearl gray, with brown and black blotches and scrawls | 27–31 mm |
| Red-winged Blackbird | pale blue-green or gray, with black, brown or purple streaks and scrawls | 22–26 mm |
| American Kestrel | white to pale reddish, blotched with brown and gray | 34–37 mm |
| Killdeer | buff with heavy black and brown blotches | 34–39 mm |
| American Crow | bluish green to olive, blotched with brown and gray | 38–46 mm |
When grackles lay eggs, state by state
Laying starts earliest in Alabama (Mar) and latest in Alberta (May). Months are estimates from regional breeding data shifted for latitude.
| State / province | Nesting season |
|---|---|
| Alabama | Mar–Jun |
| Alberta | May–Jun |
| Arkansas | Apr–Jun |
| Colorado | Apr–Jun |
| Connecticut | Apr–Jun |
| Delaware | Apr–Jun |
| Florida | Mar–Jun |
| Georgia | Mar–Jun |
| Illinois | Apr–Jun |
| Indiana | Apr–Jun |
| Iowa | Apr–Jun |
| Kansas | Apr–Jun |
| Kentucky | Apr–Jun |
| Louisiana | Mar–Jun |
| Maine | May–Jun |
| Manitoba | May–Jun |
| Maryland | Apr–Jun |
| Massachusetts | Apr–Jun |
| Michigan | Apr–Jun |
| Minnesota | May–Jun |
| Mississippi | Mar–Jun |
| Missouri | Apr–Jun |
| Montana | May–Jun |
| Nebraska | Apr–Jun |
| New Brunswick | May–Jun |
| New Hampshire | May–Jun |
| New Jersey | Apr–Jun |
| New Mexico | Apr–Jun |
| New York | Apr–Jun |
| Newfoundland and Labrador | May–Jun |
| North Carolina | Apr–Jun |
| North Dakota | May–Jun |
| Nova Scotia | May–Jun |
| Ohio | Apr–Jun |
| Oklahoma | Apr–Jun |
| Ontario | May–Jun |
| Pennsylvania | Apr–Jun |
| Prince Edward Island | May–Jun |
| Quebec | May–Jun |
| Rhode Island | Apr–Jun |
| Saskatchewan | May–Jun |
| South Carolina | Mar–Jun |
| South Dakota | Apr–Jun |
| Tennessee | Apr–Jun |
| Texas | Mar–Jun |
| Vermont | May–Jun |
| Virginia | Apr–Jun |
| West Virginia | Apr–Jun |
| Wisconsin | May–Jun |
| Wyoming | May–Jun |
From egg to fledgling
Eggs hatch after 13–14 days and the young leave 12–15 days later. See the full baby Common Grackle guide for nestling stages and what to do if you find one on the ground.
Found eggs in your yard?
- Leave them. Parents often step away for long stretches, especially before the full clutch is laid, because most songbirds do not start incubating until the last or second-to-last egg.
- A single egg on the ground is usually lost for good. Eggs cannot be hatched at home, and possession of native bird eggs is illegal without a permit.
- If a nest is somewhere inconvenient, wait it out. Most small songbirds are done in three to five weeks.
- Watch from a distance and keep pets indoors. Repeated visits can lead predators to the nest.
Questions
Frequently asked
What color are Common Grackle eggs?
Pale blue to pearl gray, with brown and black blotches and scrawls.
How big is a Common Grackle egg?
About 1.06–1.22 in long and 0.79–0.87 in wide (27–31 × 20–22 mm) — about 1.2 times the width of a US quarter.
How many eggs does a Common Grackle lay?
4–6 eggs per clutch, usually one egg a day, with 1–2 per season.
How long until Common Grackle eggs hatch?
Incubation takes 13–14 days. The young then stay in the nest 12–15 days — about 25–29 days from incubation to leaving.
Can I move or touch a Common Grackle nest with eggs?
No. Native birds, their nests and eggs are protected under the Migratory Bird Treaty Act. Wait until the young have left before removing an old nest.
Sources
- Cornell Lab of Ornithology — All About Birds: Common Grackle life history
- U.S. Fish & Wildlife Service — Migratory Bird Treaty Act
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.