If you’ve noticed a neighbor wrapping their hummingbird feeder in aluminum foil, they’re likely trying to keep the nectar fresh for longer during the hot summer months when you would usually be feeding birds.
As temperatures rise, especially above 90°F, sugary nectar can quickly spoil – fermenting or growing harmful bacteria and mold that can be dangerous to hummingbirds. Wrapping the feeder in aluminum foil helps reflect heat and sunlight away, potentially keeping the nectar cooler and safer for these delicate birds.
Aluminum foil’s shiny surface reflects both heat and light, which is why it’s used in insulation and why it can be effective for protecting feeders from the harsh sun. Beyond temperature control, the foil’s reflective quality may also help deter bees and squirrels, as the glare can confuse or discourage these persistent visitors.
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(Image credit: Jena Ardell / Moment / Getty Images)
For those hoping to attract hummingbirds, especially during peak hummingbird migration seasons, keeping nectar fresh and safe is essential. Spoiled nectar not only deters these tiny visitors but can also pose serious health risks.
However, while aluminum foil helps regulate temperature, it’s not a cure-all. Nectar can spoil quickly in extreme heat, and contaminated sugar water can lead to fungal infections that affect hummingbirds’ ability to feed.
Regularly changing the nectar, cleaning feeders thoroughly, and monitoring for cloudiness are essential steps to keep your feathered friends safe. Cloudy nectar is a clear sign of mold or bacterial growth and should be discarded immediately.
(Image credit: Getty Images)
To use this simple hack, wrap a piece of foil around the nectar reservoir of your feeder, and consider crumpling the foil slightly to create a layer of air for added insulation. Placing your feeder in a shady spot or switching to a glass feeder instead of plastic can further help regulate nectar temperature. Adding ice to the nectar or offering smaller amounts more frequently are additional ways to prevent spoilage.
By combining these simple steps with the aluminum foil wrap, you can keep your hummingbird feeder fresh, inviting, and safe – ensuring you enjoy the vibrant presence of hummingbirds throughout the summer season.
Shop hummingbird feeders and nectar
Hummingbird Electronectar Wild Bird Food, 64 Ounces
Ready-to-use, naturally clear hummingbird nectar designed to nourish and hydrate your birds. Made in the USA, this formula attracts hummingbirds without added sugar or water.
Glass Hummingbird Feeder for Outdoors Hanging, 16 Oz
This elegant glass hummingbird feeder features four metal flower feeding ports and a built-in ant moat to keep bees and ants at bay. With 360° metal perches, it offers hummingbirds a comfortable place to rest and play. The 16 oz capacity and leak-proof gasket ensure no spills, even in windy conditions.
Hummingbird Nectar, 16 Fl Oz Bottle
Pennington No Artificial Dye Hummingbird Food Concentrate, 16 oz, offers a premium and natural solution for nurturing hummingbirds. Simply mix one part concentrate with three parts water to create up to 64 oz of sweet, dye-free nectar that’s safe for all hummingbird life stages.