Grackles are a communal-roosting problem more than an individual-bird problem. They gather in large, noisy flocks, and where a flock settles into a stand of trees or a group of structures the fouling and the noise underneath build up fast. Because the birds behave much like the crows and other corvids we deal with regularly, the control approach that suits them follows the same logic: treat the roost area, make it uncomfortable, and keep it up.
Below are the Flock Free products we would use for grackles. If you would rather understand the problem first, the full guide continues underneath.
Shop Grackle Control Products
Moby – Portable Hazer
$3,249.00
Portable hazer for treating roost trees and open areas.
Bird Repellent Concentrate – 1 gallon
$395.00
Volume concentrate for roost trees and repeat treatment.
Mini Spikes, 1″ wide – 49 ft roll
$259.00
Narrow-gauge spikes for ledges grackles use as perches.
Flock Free Bird Bombs (5 pcs)
$41.99
Scent-repellent pods for small enclosed spaces. Repellent sold separately.
Flock Free Bird Bomb Bundle
$31.99
One Bird Bomb plus a 4 fl oz concentrate to soak it in.
Prices shown as listed at the time of publication. See each product page for current pricing and availability. Shipping restrictions apply to certain Flock Free Bird Repellent products in CT, IN, MD, MT, NM, RI, WI and DC — see the individual product page for current availability and shipping information. Other products on this page are not affected.
Grackle roosts vary a great deal from site to site. Call 732-987-5400 and we will look at yours — or keep reading below.
Continue Reading: How to Control Grackles
Why Grackles Become a Problem
- Flock size. The issue is rarely a few birds. Roosts can be large, and everything underneath one is affected.
- Concentrated fouling. Cars, walkways, seating, entrances and stock beneath a roost take the whole flock’s output.
- Noise. A roosting flock is loud at dawn and dusk, which matters for residential, hospitality and office sites.
- Agricultural loss. Where feed and crops are accessible, a grackle flock is a direct cost.
Where Grackles Roost
- Stands of trees, particularly dense evergreens close to parking lots and buildings.
- Structures near reliable food — retail centers, food premises, waste areas and feed stores.
- Ledges and beams used as daytime perches around those areas.
- Agricultural ground and feed storage.
Why grackles keep coming back
A roost is chosen for shelter, safety in numbers and proximity to food. Unless at least one of those changes, the flock has no reason to move, and a roost that has been used for several seasons is harder to shift than a new one. Acting early, before a roost becomes established, makes a real difference.
How to Control Grackles
Treat the roost area with bird repellent
For a roost, the practical approach is to treat the area rather than individual surfaces. The Flock Free bird repellent is plant-based and non-toxic, exempt under FIFRA 25(b), and is applied through hazers, a misting system or sprayers depending on the size of the site.
For roost trees and open ground, a portable Moby hazer lets you work between locations, a fixed Tweet Zilla covers a large commercial site, and the Mini Solar Hazer handles locations without power. A Misting System suits a fixed, defined area. Supply it with the 1 gallon concentrate, or the Ready-to-Use spray for smaller jobs.
As with any roosting species, this works as a maintained program. A single treatment moves birds for a night; a sustained one changes where they choose to settle.
Ledge protection where they perch
Where grackles are using specific ledges and beams during the day, Mini Spikes, 1″ wide suit the narrower surfaces this size of bird uses. Make sure the spacing does not leave a landing gap.
Remove the food advantage
Bins, spillage, outdoor food service and accessible feed all sustain a flock regardless of what is done to the roost itself. On grackle sites this is usually the difference between a program that works and one that does not.
Bird Bombs — spot treatment for enclosed spaces
Flock Free Bird Bombs are a scent repellent that gives you a long-lasting spot application. Each Bird Bomb is a highly absorbent pod designed to be saturated with Flock Free Bird Repellent, so the treatment stays put instead of needing to be re-sprayed.
Soak the Bird Bomb in the repellent solution — the mix rate is 50% concentrate to 50% water — then place it wherever you need to deter birds. They mount easily with zip ties or any other fastener.
They are designed for small, enclosed spaces: garbage cans, dumpsters, warehouses and small industrial facilities. On a grackle site that usually means the dumpster enclosure, the feed store or a storage building near the roost. The Bird Bombs cause irritation that suppresses the birds’ desire to feed and creates a sense of danger in that space.
The 5-pack is supplied on its own and needs Flock Free Bird Repellent separately. The Bird Bomb Bundle includes a single Bird Bomb with a 4 fl oz bottle of concentrate to soak it in.
Choosing the Right Approach
The single biggest factor with grackles is how long the roost has been there. A flock that has just started using a stand of trees will move with far less effort than one that has wintered there for years. If you are seeing the beginnings of a roost, act now rather than waiting to see whether it settles — it will.
After that, look at what they are roosting in. Trees are an area problem, and that is what hazers and misting are built for. If the flock is also using ledges and beams around the buildings during the day, add narrow-gauge spikes on those specific perches.
Food is the other half of it. Bins, spillage, outdoor food service and open feed will hold a flock in place no matter how well the roost itself is treated.
One practical point: think about what sits underneath and nearby before you choose a method. Roosts over parking lots, entrances and seating are the ones people notice, and residential neighbors close by will shape what is sensible to do and when. Since 2007, Flock Free has been moving roosts off commercial and municipal sites — call 732-987-5400 and we will help you plan it.
Related Bird Control Resources
- Bird Control Tips by Species of the Birds — our guidance across the other species we treat.
- Hazers and Sprayers — application equipment.
- Liquid Products — the bird repellent range.
- Bird Spikes — including the small-bird Mini Spikes range.
- Commercial Bird Control Services — for larger sites and managed programs.
Shop by Bird
Flock Free guidance for the other species we treat: