A bird feeder left up overnight is, from a foraging opossum's point of view, a reliable pile of calorie-dense food that appears in the same spot every single evening. It is not the seed in the feeder itself that draws them in most cases — it is what falls beneath it. Millet, cracked corn, and broken sunflower shells accumulate on the ground under almost any feeder, and that spillage is exactly the kind of easy, energy-rich food an opportunistic omnivore has no reason to pass up.
Why Feeders Specifically Attract Them
Feeder spillage solves two problems for a foraging opossum at once: it is calorically dense and it requires almost no effort to access compared to hunting insects or searching for fruit. Sunflower seeds in particular are high in fat, and the husks and dropped seed under a well-used feeder can accumulate faster than most people realize, especially with feeders that squirrels or larger birds regularly knock or scatter from. An opossum visiting after dark, once the birds and squirrels have gone quiet for the night, simply cleans up what daytime visitors left behind.
In most cases, no. An opossum eating spilled birdseed is low-risk, low-conflict behavior — it does not raid the feeder itself, does not typically damage feeder hardware, and does not compete meaningfully with birds for food during daylight hours when the birds are actually feeding.
When It's Worth Managing
The main reasons to actively discourage the behavior are not about the opossum itself but about what else spilled seed can draw in alongside it. Accumulated seed under a feeder attracts rodents, and a steady rodent population can in turn draw larger predators into the yard, including the raptors covered in our guide to great horned owls and other backyard raptors, or opportunistic coyotes, discussed in our piece on urban coyote ecology. If the goal is to keep the overall list of nightly visitors shorter and more predictable, reducing spillage addresses the root cause more effectively than trying to exclude any single species.
Reducing Spillage Without Losing the Birds
A tray or seed catcher mounted under the feeder captures a large share of what would otherwise fall to the ground, and switching to hulled sunflower or a no-mess blend eliminates the husk buildup that seed-only blends leave behind. Raking or sweeping the area under a feeder every few days, rather than letting spillage accumulate over weeks, keeps the ground-level food supply low enough that it stops functioning as a reliable nightly resource without requiring the feeder to come down entirely.
Feeder Placement and Ground Access
Feeder height and placement matter less for opossums than for squirrels, since opossums are foraging on the ground rather than trying to reach the feeder itself. The more relevant placement question is distance from cover: an opossum, like most prey species, is more comfortable foraging near a hedge, fence line, or shrub it can retreat to quickly, discussed further in our guide to native plants and backyard wildlife habitat. A feeder positioned well away from cover, in an open, well-lit area, will generally see less nighttime opossum activity underneath it than one tucked against a fence line, simply because the open approach feels riskier to a cautious forager.
Bringing Feeders In at Night
For anyone who wants birds during the day without any nocturnal visitors at all, the simplest fix is bringing the feeder inside a garage or shed each evening and putting it back out at dawn. This eliminates the overnight food source entirely without changing anything about how the feeder functions for birds during daylight hours, and it is a far more targeted solution than removing the feeder altogether. It also reduces spillage exposure to rain, which helps prevent moldy seed — a separate but related reason many feeder guides, including resources from the Cornell Lab of Ornithology, recommend regular cleanup regardless of what wildlife is or is not visiting at night.
The Bigger Picture
An opossum under a bird feeder is one of the least concerning nocturnal visitors a yard is likely to attract — it is not aggressive, does not raid nests, and does not pose a meaningful threat to the birds a feeder is meant to support. Managing it comes down to a straightforward tradeoff between how much spillage a household is comfortable leaving on the ground overnight and how many additional nocturnal visitors that spillage is willing to invite in behind it.